[NewPM][AMDGPU] Skip adding CGSCCOptimizerLate callbacks at O0

[aeubanks]

Summary

The legacy PM's EP_CGSCCOptimizerLate was only used under not-O0.

Fixes clang/test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp under the new PM.

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

PB.registerPipelineEarlySimplificationEPCallback(
         }
         if (EarlyInlineAll && !EnableFunctionCalls)
           PM.addPass(AMDGPUAlwaysInlinePass());
       });
 
   PB.registerCGSCCOptimizerLateEPCallback(
       [this, DebugPassManager](CGSCCPassManager &PM,
                                PassBuilder::OptimizationLevel Level) {
-          FunctionPassManager FPM(DebugPassManager);
+        if (Level == PassBuilder::OptimizationLevel::O0)
+          return;
+
 
-          // Add infer address spaces pass to the opt pipeline after inlining
-          // but before SROA to increase SROA opportunities.
-          FPM.addPass(InferAddressSpacesPass());
 
-          // This should run after inlining to have any chance of doing
-          // anything, and before other cleanup optimizations.
-          FPM.addPass(AMDGPULowerKernelAttributesPass());
 
-          if (Level != PassBuilder::OptimizationLevel::O0) {
-            // Promote alloca to vector before SROA and loop unroll. If we
-            // manage to eliminate allocas before unroll we may choose to unroll
-            // less.
-            FPM.addPass(AMDGPUPromoteAllocaToVectorPass(*this));
-          }
 
-          PM.addPass(createCGSCCToFunctionPassAdaptor(std::move(FPM)));
       });
 }
 
 //===----------------------------------------------------------------------===//
 // R600 Target Machine (R600 -> Cayman)
 //===----------------------------------------------------------------------===//
 
 R600TargetMachine::R600TargetMachine(const Target &T, const Triple &TT,