Fix a couple of bugs, add some new cool stuff.

1. Fix a todo in Parser::ParseTag, to recover better.  On code like
   that in test/Sema/decl-invalid.c it causes us to return a single
   error instead of multiple.
2. Fix an error in Sema::ParseDeclarator, where it would crash if the
   declarator didn't have an identifier.  Instead, diagnose the problem.
3. Start adding infrastructure to track the range of locations covered
   by a declspec or declarator.  This is mostly implemented for declspec,
   but could be improved, it is missing for declarator.

Thanks to Neil for pointing out this crash.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40482 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Parser/expressions.c b/test/Parser/expressions.c
new file mode 100644
index 0000000..3abb6d3
--- /dev/null
+++ b/test/Parser/expressions.c
@@ -0,0 +1,32 @@
+// RUN: clang -fsyntax-only %s
+// XFAIL: *
+// FIXME: This is xfailed because we're not analyzing brace initializers yet.
+
+void test1() {
+  if (sizeof (int){ 1});   // sizeof compound literal
+  if (sizeof (int));       // sizeof type
+
+  (int)4;   // cast.
+  (int){4}; // compound literal.
+
+  // FIXME: change this to the struct version when we can.
+  //int A = (struct{ int a;}){ 1}.a;
+  int A = (int){ 1}.a;
+}
+
+int test2(int a, int b) {
+  return a ? a,b : a;
+}
+
+int test3(int a, int b, int c) {
+  return a = b = c;
+}
+
+int test4() {
+  test4();
+}
+
+int test_offsetof() {
+  // FIXME: change into something that is semantically correct.
+  __builtin_offsetof(int, a.b.c[4][5]);
+}