[llvm] [X86][GlobalISel] Enable SINCOS with libcall mapping (PR #142438)

[Matt Arsenault via llvm-commits]

================
@@ -648,6 +650,53 @@ simpleLibcall(MachineInstr &MI, MachineIRBuilder &MIRBuilder, unsigned Size,
                        LocObserver, &MI);
 }
 
+LegalizerHelper::LegalizeResult LegalizerHelper::simpleLibcallSinCos(
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arsenm wrote:

```suggestion
LegalizerHelper::LegalizeResult LegalizerHelper::emitSincosLibcall(
```

https://github.com/llvm/llvm-project/pull/142438