[llvm] SelectionDAG: Use qNaN constant if FCANONICALIZE not LegalOrCustom (PR #104564)

[Matt Arsenault via llvm-commits]

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@@ -668,6 +669,8 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
       setOperationAction(ISD::FSIN   , VT, Expand);
       setOperationAction(ISD::FCOS   , VT, Expand);
       setOperationAction(ISD::FSINCOS, VT, Expand);
+
+      setOperationAction(ISD::FCANONICALIZE, VT, Expand);
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arsenm wrote:

This is just a workaround with no actual expand implementation 

https://github.com/llvm/llvm-project/pull/104564