[clang] [Clang][Cygwin] Use correct BuiltinVaListKind. (PR #143166)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (jeremyd2019)

<details>
<summary>Changes</summary>

This was in older patches for Cygwin support, but was somehow lost in the latest rounds.

---
Full diff: https://github.com/llvm/llvm-project/pull/143166.diff


1 Files Affected:

- (modified) clang/lib/Basic/Targets/X86.h (+4) 


``````````diff
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index 3d58be8f898c6..b3fe98c5c742f 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -984,6 +984,10 @@ class LLVM_LIBRARY_VISIBILITY CygwinX86_64TargetInfo : public X86_64TargetInfo {
     this->WCharType = TargetInfo::UnsignedShort;
   }
 
+  BuiltinVaListKind getBuiltinVaListKind() const override {
+    return TargetInfo::CharPtrBuiltinVaList;
+  }
+
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override {
     X86_64TargetInfo::getTargetDefines(Opts, Builder);

``````````

</details>


https://github.com/llvm/llvm-project/pull/143166