[OPENMP50]Add support for 'parallel master taskloop' construct.

Added parsing/sema/codegen support for 'parallel master taskloop'
constructs. Some of the clauses, like 'grainsize', 'num_tasks', 'final'
and 'priority' are not supported in full, only constant expressions can
be used currently in these clauses.

llvm-svn: 374791
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index ad4d935..5276a97 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -44,6 +44,7 @@
   OMPD_target_teams_distribute_parallel,
   OMPD_mapper,
   OMPD_variant,
+  OMPD_parallel_master,
 };
 
 class DeclDirectiveListParserHelper final {
@@ -136,7 +137,9 @@
        OMPD_target_teams_distribute_parallel_for},
       {OMPD_target_teams_distribute_parallel_for, OMPD_simd,
        OMPD_target_teams_distribute_parallel_for_simd},
-      {OMPD_master, OMPD_taskloop, OMPD_master_taskloop}};
+      {OMPD_master, OMPD_taskloop, OMPD_master_taskloop},
+      {OMPD_parallel, OMPD_master, OMPD_parallel_master},
+      {OMPD_parallel_master, OMPD_taskloop, OMPD_parallel_master_taskloop}};
   enum { CancellationPoint = 0, DeclareReduction = 1, TargetData = 2 };
   Token Tok = P.getCurToken();
   unsigned DKind =
@@ -1505,6 +1508,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_parallel_master_taskloop:
   case OMPD_distribute:
   case OMPD_end_declare_target:
   case OMPD_target_update:
@@ -1560,17 +1564,15 @@
 ///         'barrier' | 'taskwait' | 'flush' | 'ordered' | 'atomic' |
 ///         'for simd' | 'parallel for simd' | 'target' | 'target data' |
 ///         'taskgroup' | 'teams' | 'taskloop' | 'taskloop simd' | 'master
-///         taskloop' | 'distribute' | 'target enter data' | 'target exit data'
-///         | 'target parallel' | 'target parallel for' | 'target update' |
-///         'distribute parallel for' | 'distribute paralle for simd' |
-///         'distribute simd' | 'target parallel for simd' | 'target simd' |
-///         'teams distribute' | 'teams distribute simd' |
-///         'teams distribute parallel for simd' |
-///         'teams distribute parallel for' | 'target teams' |
-///         'target teams distribute' |
-///         'target teams distribute parallel for' |
-///         'target teams distribute parallel for simd' |
-///         'target teams distribute simd' {clause}
+///         taskloop' | 'parallel master taskloop' | 'distribute' | 'target
+///         enter data' | 'target exit data' | 'target parallel' | 'target
+///         parallel for' | 'target update' | 'distribute parallel for' |
+///         'distribute paralle for simd' | 'distribute simd' | 'target parallel
+///         for simd' | 'target simd' | 'teams distribute' | 'teams distribute
+///         simd' | 'teams distribute parallel for simd' | 'teams distribute
+///         parallel for' | 'target teams' | 'target teams distribute' | 'target
+///         teams distribute parallel for' | 'target teams distribute parallel
+///         for simd' | 'target teams distribute simd' {clause}
 ///         annot_pragma_openmp_end
 ///
 StmtResult
@@ -1747,6 +1749,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_parallel_master_taskloop:
   case OMPD_distribute:
   case OMPD_distribute_parallel_for:
   case OMPD_distribute_parallel_for_simd: