[llvm] [Associativity]: Make FMul associative operator (PR #113269)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

> This is incorrect, fmul is only associative with the reassoc flag. And this is already handled in the member isAssociative() function (rather than the one taking an Opcode).

Yes, that's true. I will close the pull request. Thank you :)

https://github.com/llvm/llvm-project/pull/113269