[clang][openmp] - Do not add hip_host_overlay.h for HIP compilation

This header only needs added for openmp offloading involving
hipMalloc or hipHostMalloc. This fixes a linker error
regarding a missing symbol, omp_register_coarse_grain_mem,
when compiling HIP with host openmp via -fopenmp.

Change-Id: I8f1842661a026e4172a87dc25112478dd032bae9

Author: estewart08

clang/lib/Driver/ToolChains/Clang.cpp

@@ -1125,8 +1125,7 @@ void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
 
   // When host compiling with OpenMP or HIP offloading include
   // the host overlay definitions.
-  if ((JA.isHostOffloading(Action::OFK_OpenMP)) ||
-      (JA.isHostOffloading(Action::OFK_HIP))) {
+  if (JA.isHostOffloading(Action::OFK_OpenMP)) {
     SmallString<128> P(D.ResourceDir);
     llvm::sys::path::append(P, "include");
     llvm::sys::path::append(P, "openmp_wrappers");