[OPENMP 4.5] Parsing/sema analysis for 'priority' clause.
OpenMP 4.5 defines new clause 'priority' for 'task', 'taskloop' and 'taskloop simd' directives. Added parsing and sema analysis for 'priority' clause in 'task' and 'taskloop' directives.

llvm-svn: 254398
diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index f6bed54..2e9ac07 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -137,6 +137,7 @@
   case OMPC_simd:
   case OMPC_num_teams:
   case OMPC_thread_limit:
+  case OMPC_priority:
     break;
   }
   llvm_unreachable("Invalid OpenMP simple clause kind");
@@ -237,6 +238,7 @@
   case OMPC_simd:
   case OMPC_num_teams:
   case OMPC_thread_limit:
+  case OMPC_priority:
     break;
   }
   llvm_unreachable("Invalid OpenMP simple clause kind");