[llvm] [RISCV][GISel] Attempt to simplify how we handle type legality for F and D extensions. (PR #72174)

[Craig Topper via llvm-commits]

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@@ -23,6 +23,15 @@
 using namespace llvm;
 using namespace LegalityPredicates;
 
+static LegalityPredicate typeIsLegalScalarFP(unsigned TypeIdx,
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topperc wrote:

This function will only get Zfh added to it. `typeIsScalarFPArith`? G_FTRUNC/G_FPEXT are the only ones touched by this patch that need Zfhmin.

https://github.com/llvm/llvm-project/pull/72174