[llvm] [AMDGPU][NPM] Support -regalloc-npm options (PR #129035)

[Matt Arsenault via llvm-commits]

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@@ -2141,6 +2160,113 @@ void AMDGPUCodeGenPassBuilder::addMachineSSAOptimization(
   addPass(SIShrinkInstructionsPass());
 }
 
+static const char NPMRegAllocOptNotSupportedMessage[] =
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arsenm wrote:

Use StringLiteral? 

https://github.com/llvm/llvm-project/pull/129035