[clang] [clang][ASTImporter] Support Importer of BuiltinBitCastExpr (PR #74813)

[Balázs Kéri via cfe-commits]

================
@@ -3220,6 +3220,12 @@ TEST_P(ImportExpr, UnresolvedMemberExpr) {
                  compoundStmt(has(callExpr(has(unresolvedMemberExpr())))))))));
 }
 
+TEST_P(ImportExpr, BuiltinBitCastExpr) {
+  MatchVerifier<Decl> Verifier;
+  testImport("void declToImport(int T) { (void)__builtin_bit_cast(float, T); }",
+             Lang_CXX20, "", Lang_CXX20, Verifier, functionDecl());
+}
+
----------------
balazske wrote:

I did mean to add this test (and the AST matcher) (after test for `ImportVAArgExpr` near line 563), and the other is not needed:
```
TEST_P(ImportExpr, ImportBuiltinBitCastExpr) {
  MatchVerifier<Decl> Verifier;
  testImport("void declToImport(int X) {"
             "  (void)__builtin_bit_cast(float, X); }",
             Lang_CXX20, "", Lang_CXX20, Verifier,
             functionDecl(hasDescendant(
                 cStyleCastExpr(hasSourceExpression(builtinBitCastExpr())))));
}
```

https://github.com/llvm/llvm-project/pull/74813