ac: fix build with recent LLVM

Build is broken since "Move CodeGenFileType enum to Support/CodeGen.h".

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>

src/amd/llvm/ac_llvm_helper.cpp

@@ -192,7 +192,11 @@ struct ac_compiler_passes *ac_create_llvm_passes(LLVMTargetMachineRef tm)
 
 	if (TM->addPassesToEmitFile(p->passmgr, p->ostream,
 				    nullptr,
+#if LLVM_VERSION_MAJOR >= 10
+				    llvm::CGFT_ObjectFile)) {
+#else
 				    llvm::TargetMachine::CGFT_ObjectFile)) {
+#endif
 		fprintf(stderr, "amd: TargetMachine can't emit a file of this type!\n");
 		delete p;
 		return NULL;