[llvm] [RISCV][GISel] Add support for G_IS_FPCLASS in F and D extensions (PR #72000)

[Craig Topper via llvm-commits]

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@@ -223,6 +224,8 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST) {
       })
       .clampScalar(0, sXLen, sXLen);
 
+  getActionDefinitionsBuilder(G_IS_FPCLASS).custom();
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topperc wrote:

Please rebase and then use `customIf(typeIsScalarFPArith(1, ST)` so that we don't do the custom lowering if F or D isn't enabled.

https://github.com/llvm/llvm-project/pull/72000