[llvm] [GlobalIsel] Canonicalize G_FCMP (PR #108891)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

We zext the APInt:
https://github.com/llvm/llvm-project/blob/30d7dcc1db476b828d3b0a7b5c9bcfbe5bd5f216/llvm/lib/CodeGen/GlobalISel/Utils.cpp#L369

https://github.com/llvm/llvm-project/pull/108891