[clang] [Clang][Xtensa] Add Xtensa target. (PR #118008)

[Eli Friedman via cfe-commits]

================
@@ -9727,6 +9727,51 @@ static TypedefDecl *CreateHexagonBuiltinVaListDecl(const 
ASTContext *Context) {
   return Context->buildImplicitTypedef(VaListTagArrayType, 
"__builtin_va_list");
 }
 
+static TypedefDecl *
+CreateXtensaABIBuiltinVaListDecl(const ASTContext *Context) {
+  // typedef struct __va_list_tag {
+  RecordDecl *VaListTagDecl;
+
+  VaListTagDecl = Context->buildImplicitRecord("__va_list_tag");
+  VaListTagDecl->startDefinition();
+
+  const size_t NumFields = 3;
+  QualType FieldTypes[NumFields];
----------------
efriedma-quic wrote:

```suggestion
  QualType FieldTypes[] = {Context->getPointerType(Context->IntTy), 
Context->getPointerType(Context->IntTy), Context->IntTy};
```

https://github.com/llvm/llvm-project/pull/118008
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