[OPENMP50]Add basic support for depobj construct.

Added basic parsing/sema/serialization support for depobj directive.
diff --git a/clang/test/OpenMP/depobj_messages.cpp b/clang/test/OpenMP/depobj_messages.cpp
new file mode 100644
index 0000000..87b619c
--- /dev/null
+++ b/clang/test/OpenMP/depobj_messages.cpp
@@ -0,0 +1,151 @@
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=50 -ferror-limit 100 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -fopenmp-version=50 -ferror-limit 100 %s -Wuninitialized
+
+struct S1 { // expected-note 2 {{declared here}}
+  int a;
+} s;
+
+#pragma omp depobj(0) depend(in:s) // expected-error {{unexpected OpenMP directive '#pragma omp depobj'}}
+void foo() {
+#pragma omp depobj(0) depend(in:s) // expected-error {{'omp_depend_t' type not found; include <omp.h>}} expected-error {{expected lvalue expression}}}
+}
+
+typedef void *omp_depend_t;
+
+template <class T>
+T tmain(T argc) {
+  omp_depend_t x;
+#pragma omp depobj() allocate(argc) // expected-error {{expected expression}} expected-error {{expected depobj expression}} expected-error {{unexpected OpenMP clause 'allocate' in directive '#pragma omp depobj'}}
+  ;
+#pragma omp depobj(x) untied  // expected-error {{unexpected OpenMP clause 'untied' in directive '#pragma omp depobj'}}
+#pragma omp depobj(x) unknown // expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}}
+  if (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    if (argc) {
+#pragma omp depobj(x) depend(in:s)
+    }
+  while (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    while (argc) {
+#pragma omp depobj(x) depend(in:s)
+    }
+  do
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    while (argc)
+      ;
+  do {
+#pragma omp depobj(x) depend(in:s)
+  } while (argc);
+  switch (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    switch (argc)
+    case 1:
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+  switch (argc)
+  case 1: {
+#pragma omp depobj(x) depend(in:s)
+  }
+  switch (argc) {
+#pragma omp depobj(x) depend(in:s)
+  case 1:
+#pragma omp depobj(x) depend(in:s)
+    break;
+  default: {
+#pragma omp depobj(x) depend(in:s)
+  } break;
+  }
+  for (;;)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    for (;;) {
+#pragma omp depobj(x) depend(in:s)
+    }
+label:
+#pragma omp depobj(x) depend(in:s)
+label1 : {
+#pragma omp depobj(x) depend(in:s)
+}
+
+#pragma omp depobj                               // expected-error {{expected depobj expression}}
+#pragma omp depobj(                              // expected-error {{expected expression}} expected-error {{expected depobj expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+#pragma omp depobj()                             // expected-error {{expected expression}} expected-error {{expected depobj expression}}
+#pragma omp depobj(argc                          // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}}
+#pragma omp depobj(argc,                         // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp depobj(argc)                         // expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp depobj(S1) // expected-error {{'S1' does not refer to a value}} expected-error {{expected depobj expression}}
+#pragma omp depobj(argc) depobj(argc) // expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}}
+#pragma omp parallel depobj(argc) // expected-warning {{extra tokens at the end of '#pragma omp parallel' are ignored}}
+  ;
+  return T();
+}
+
+int main(int argc, char **argv) {
+omp_depend_t x;
+#pragma omp depobj(x) depend(in:s)
+  ;
+#pragma omp depobj(x) untied  // expected-error {{unexpected OpenMP clause 'untied' in directive '#pragma omp depobj'}}
+#pragma omp depobj(x) unknown // expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}}
+  if (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    if (argc) {
+#pragma omp depobj(x) depend(in:s)
+    }
+  while (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    while (argc) {
+#pragma omp depobj(x) depend(in:s)
+    }
+  do
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    while (argc)
+      ;
+  do {
+#pragma omp depobj(x) depend(in:s)
+  } while (argc);
+  switch (argc)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    switch (argc)
+    case 1:
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+  switch (argc)
+  case 1: {
+#pragma omp depobj(x) depend(in:s)
+  }
+  switch (argc) {
+#pragma omp depobj(x) depend(in:s)
+  case 1:
+#pragma omp depobj(x) depend(in:s)
+    break;
+  default: {
+#pragma omp depobj(x) depend(in:s)
+  } break;
+  }
+  for (;;)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
+    for (;;) {
+#pragma omp depobj(x) depend(in:s)
+    }
+label:
+#pragma omp depobj(x) depend(in:s)
+label1 : {
+#pragma omp depobj(x) depend(in:s)
+}
+
+#pragma omp depobj                               // expected-error {{expected depobj expression}}
+#pragma omp depobj(                              // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected depobj expression}}
+#pragma omp depobj()                             // expected-error {{expected expression}} expected-error {{expected depobj expression}}
+#pragma omp depobj(argc                          // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp depobj(argc,                         // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp depobj(argc)                         // expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp depobj(S1) // expected-error {{'S1' does not refer to a value}} expected-error {{expected depobj expression}}
+#pragma omp depobj(argc) depobj(argc) // expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}} expected-error {{expected lvalue expression of 'omp_depend_t' type, not 'int'}}
+#pragma omp parallel depobj(argc) // expected-warning {{extra tokens at the end of '#pragma omp parallel' are ignored}}
+  ;
+#pragma omp depobj(x) seq_cst // expected-error {{unexpected OpenMP clause 'seq_cst' in directive '#pragma omp depobj'}}
+#pragma omp depobj(x) depend(in: x)
+#pragma omp depobj(x) (x) depend(in: x) // expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}}
+#pragma omp depobj(x) depend(in: x) depend(out:x) // expected-error {{exactly one of 'depend', 'destroy', or 'update' clauses is expected}}
+#pragma omp depend(out:x) depobj(x) // expected-error {{expected an OpenMP directive}}
+#pragma omp depobj depend(in:x) (x) // expected-error {{expected depobj expression}} expected-warning {{extra tokens at the end of '#pragma omp depobj' are ignored}}
+  return tmain(argc); // expected-note {{in instantiation of function template specialization 'tmain<int>' requested here}}
+}