[AMDGPU] Correction to 095c48fdf3d27a4f346f8680d1d7e89449bb557b.

Differential Revision: https://reviews.llvm.org/D110337

Author: kpyzhov

llvm/lib/Transforms/Utils/AMDGPUEmitPrintf.cpp

@@ -63,7 +63,9 @@ static Value *callPrintfBegin(IRBuilder<> &Builder, Value *Version) {
   auto Int64Ty = Builder.getInt64Ty();
   auto M = Builder.GetInsertBlock()->getModule();
   auto Fn = M->getOrInsertFunction("__ockl_printf_begin", Int64Ty, Int64Ty);
-  M->addModuleFlag(llvm::Module::Override, "amdgpu_hostcall", 1);
+  if (!M->getModuleFlag("amdgpu_hostcall")) {
+    M->addModuleFlag(llvm::Module::Override, "amdgpu_hostcall", 1);
+  }
   return Builder.CreateCall(Fn, Version);
 }