[llvm] [X86][GlobalISel] Support G_FCMP for scalar cases (PR #123598)

[via llvm-commits]

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@@ -449,8 +449,11 @@ X86LegalizerInfo::X86LegalizerInfo(const X86Subtarget &STI,
   // fp comparison
   getActionDefinitionsBuilder(G_FCMP)
       .legalIf([=](const LegalityQuery &Query) {
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mahesh-attarde wrote:

Are you suggesting `LegalizeRuleSet &legalIf(LegalityPredicate Predicate)` use instead of `LegalityQuery`?
`HasSSE1` , `HasSSE2` and `UseX87` are coming from subtarget in constructor.

https://github.com/llvm/llvm-project/pull/123598