[llvm] DAG: Consider __sincos_stret when deciding to form fsincos (PR #165169)

[Benjamin Maxwell via llvm-commits]

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@@ -84,6 +84,10 @@ LLVM_ABI Libcall getSINCOS(EVT RetVT);
 /// UNKNOWN_LIBCALL if there is none.
 LLVM_ABI Libcall getSINCOSPI(EVT RetVT);
 
+/// getSINCOS - Return the SINCOS_STRET_ value for the given types, or
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MacDue wrote:

nit: typos:
```suggestion
/// getSINCOS_STRET - Return the SINCOS_STRET_* value for the given types, or
```

https://github.com/llvm/llvm-project/pull/165169