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

[Alexis Engelke via llvm-commits]

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@@ -51,6 +51,15 @@ namespace Intrinsic {
 typedef unsigned ID;
 }
 
+/// Provide fast-math flags storage, instructions that support fast-math flags
+/// should inherit from this class.
+class FastMathFlagsStorage {
+  friend class FPMathOperator;
+
+protected:
+  unsigned short FMFValue = 0;
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aengelke wrote:

Probably should be an enum type. Why not FastMathFlags? In any case, we shouldn't hard-code unsigned short everywhere.

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