OpenMP version 5.0 added

Add build option LIBOMP_OMP_VERSION=50, 5.0 headers, and add the year/month
associated with OpenMP 5.0 in relevant source locations. Also, remove the
deprecated LIBOMP_OMP_VERSION=41 option.

Patch by Olga Malysheva

Differential Revision: https://reviews.llvm.org/D30450


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@297083 91177308-0d34-0410-b5e6-96231b3b80d8

runtime/src/kmp_runtime.cpp

@@ -45,7 +45,9 @@ char const __kmp_version_alt_comp[] = KMP_VERSION_PREFIX "alternative compiler s
 #endif /* defined(KMP_GOMP_COMPAT) */
 
 char const __kmp_version_omp_api[] = KMP_VERSION_PREFIX "API version: "
-#if OMP_45_ENABLED
+#if OMP_50_ENABLED
+    "5.0 (201611)";
+#elif OMP_45_ENABLED
     "4.5 (201511)";
 #elif OMP_40_ENABLED
     "4.0 (201307)";