[AMDGPU] honor enable-new-pm and run-pass while enabling NPM for llc

Author: vikramRH

llvm/tools/llc/llc.cpp

@@ -655,8 +655,15 @@ static int compileModule(char **argv, LLVMContext &Context) {
   else if (VerifyEach)
     VK = VerifierKind::EachPass;
 
-  if (EnableNewPassManager || !PassPipeline.empty() ||
-      Target->EnableNewPMForBackend()) {
+  bool RunNewPM = false;
+  if (EnableNewPassManager || !PassPipeline.empty())
+    RunNewPM = true;
+  else if (RunPass.getNumOccurrences())
+    RunNewPM = false;
+  else if (Target->EnableNewPMForBackend() && !EnableNewPassManager.getNumOccurrences())
+    RunNewPM = true;
+
+  if (RunNewPM) {
     return compileModuleWithNewPM(argv[0], std::move(M), std::move(MIR),
                                   std::move(Target), std::move(Out),
                                   std::move(DwoOut), Context, TLII, VK,