[llvm] [X86][GlobalIsel] Reland G_ISFPCLASS (PR #165848)

[Evgenii Kudriashov via llvm-commits]

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@@ -51,27 +50,16 @@ entry:
 }
 
 define i1 @issignaling_f(float %x) nounwind {
-; X86-LABEL: issignaling_f:
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e-kud wrote:

It looks like there is a conflict between `X86` and `X86-GISEL`.
Why aren't `X64-SDAGISEL` and `X64-FASTISEL` collapsed into `X64`?

https://github.com/llvm/llvm-project/pull/165848