Merge pull request llvm#556 from AMD-Lightning-Internal/amd/dev/grodgers/fix-internalize

[OpenMP] Fix from Joseph to preserve symbol for __llvm_rpc_client

Author: ronlieb

llvm/lib/Transforms/IPO/Internalize.cpp

@@ -234,7 +234,8 @@ bool InternalizePass::internalizeModule(Module &M) {
     AlwaysPreserved.insert("__stack_chk_guard");
 
   // Preserve the RPC interface for GPU host callbacks when internalizing.
-  if (Triple(M.getTargetTriple()).isNVPTX())
+  if (Triple(M.getTargetTriple()).isNVPTX() ||
+      Triple(M.getTargetTriple()).isAMDGPU())
     AlwaysPreserved.insert("__llvm_rpc_client");
 
   // Mark all functions not in the api as internal.