[llvm] [AMDGPU] Implement IR expansion for frem instruction (PR #130988)

[Matt Arsenault via llvm-commits]

================
@@ -673,21 +1071,31 @@ static bool runImpl(Function &F, const TargetLowering &TLI) {
 
 namespace {
 class ExpandFpLegacyPass : public FunctionPass {
+  CodeGenOptLevel OptLevel;
+
 public:
   static char ID;
 
-  ExpandFpLegacyPass() : FunctionPass(ID) {
+  ExpandFpLegacyPass(CodeGenOptLevel OptLevel)
+      : FunctionPass(ID), OptLevel(OptLevel) {
     initializeExpandFpLegacyPassPass(*PassRegistry::getPassRegistry());
   }
 
+  ExpandFpLegacyPass() : ExpandFpLegacyPass(CodeGenOptLevel::None) {};
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arsenm wrote:

```suggestion
  ExpandFpLegacyPass(CodeGenOptLevel OptLevel = CodeGenOptLevel::None)
      : FunctionPass(ID), OptLevel(OptLevel) {
    initializeExpandFpLegacyPassPass(*PassRegistry::getPassRegistry());
  }
```

https://github.com/llvm/llvm-project/pull/130988