[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/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index 162890e..ae2b485 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -6849,6 +6849,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_parallel_master_taskloop:
   case OMPD_requires:
   case OMPD_unknown:
     break;
@@ -7156,6 +7157,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_parallel_master_taskloop:
   case OMPD_requires:
   case OMPD_unknown:
     break;
@@ -8928,6 +8930,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_parallel_master_taskloop:
     case OMPD_requires:
     case OMPD_unknown:
       llvm_unreachable("Unexpected directive.");
@@ -9686,6 +9689,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_parallel_master_taskloop:
     case OMPD_requires:
     case OMPD_unknown:
       llvm_unreachable("Unknown target directive for OpenMP device codegen.");
@@ -10313,6 +10317,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_parallel_master_taskloop:
     case OMPD_target:
     case OMPD_target_simd:
     case OMPD_target_teams_distribute: