[OPENMP50]Add support for 'release' clause.

Added full support for 'release' clause in flush|atomic directives.
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index abe988b..b303851 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -522,6 +522,8 @@
 
 void OMPClauseProfiler::VisitOMPAcquireClause(const OMPAcquireClause *) {}
 
+void OMPClauseProfiler::VisitOMPReleaseClause(const OMPReleaseClause *) {}
+
 void OMPClauseProfiler::VisitOMPThreadsClause(const OMPThreadsClause *) {}
 
 void OMPClauseProfiler::VisitOMPSIMDClause(const OMPSIMDClause *) {}