[llvm] [Xtensa] Implement Xtensa Floating Point Option. (PR #136086)

[Matt Arsenault via llvm-commits]

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@@ -185,6 +291,11 @@ bool XtensaTargetLowering::isOffsetFoldingLegal(
   return false;
 }
 
+bool XtensaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT,
+                                        bool ForCodeSize) const {
+  return false;
+}
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arsenm wrote:

I believe this is redundant if you make ConstantFP Expand 

https://github.com/llvm/llvm-project/pull/136086