[llvm] [IR] Store fast-math flags in subclasses of Instruction (PR #191190)

[Alexis Engelke via llvm-commits]

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@@ -4346,15 +4361,27 @@ GetElementPtrInst *GetElementPtrInst::cloneImpl() const {
 }
 
 UnaryOperator *UnaryOperator::cloneImpl() const {
-  return Create(getOpcode(), Op<0>());
+  auto *I = Create(getOpcode(), Op<0>());
+  I->FMFValue = FMFValue;
+  return I;
 }
 
 BinaryOperator *BinaryOperator::cloneImpl() const {
+  if (auto *I = dyn_cast<FPBinaryOperator>(this))
+    return I->cloneImpl();
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aengelke wrote:

Only caller is Instruction, which should dispatch to FPBinaryOperator, so this should never be reached, assert instead.

https://github.com/llvm/llvm-project/pull/191190