[OPENMP] Support for -fopenmp-simd option with compilation of simd loops

only.

Added support for -fopenmp-simd option that allows compilation of
simd-based constructs without emission of OpenMP runtime calls.

llvm-svn: 321560

clang/test/OpenMP/taskloop_simd_aligned_messages.cpp

@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -x c++ -std=c++11 -verify -fopenmp %s
 
+// RUN: %clang_cc1 -x c++ -std=c++11 -verify -fopenmp-simd %s
+
 struct B {
   static int ib[20]; // expected-note 0 {{'B::ib' declared here}}
   static constexpr int bfoo() { return 8; }