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

[Alexis Engelke via llvm-commits]

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aengelke wrote:

Looked at this more closely. It looks like this constructor with a non-null FlagsSource is *only* called from FCmpInst, in which case it should *definitly* copy FMF. I think the constructor should be modified to no longer take FlagsSource as parameter then.

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