[clang] [libc] [llvm] [NVPTX] Implement variadic functions using IR lowering (PR #96015)

[Joseph Huber via cfe-commits]

================
@@ -116,8 +116,7 @@ class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public TargetInfo {
   }
 
   BuiltinVaListKind getBuiltinVaListKind() const override {
-    // FIXME: implement
-    return TargetInfo::CharPtrBuiltinVaList;
+    return TargetInfo::VoidPtrBuiltinVaList;
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jhuber6 wrote:

```suggestion
    return TargetInfo::CharPtrBuiltinVaList;
```

https://github.com/llvm/llvm-project/pull/96015