[clang-tools-extra] [include-cleaner] Add WalkAST unit tests for Objective-C constructs (PR #220763)

[Dave MacLachlan via cfe-commits]

================
@@ -579,6 +579,8 @@ TEST(WalkAST, CleanupAttr) {
            "void foo() { __attribute__((__cleanup__(^freep))) char* x = 0; }");
 }
 
+// Objective-C Test
----------------
dmaclach wrote:

Fixed!

https://github.com/llvm/llvm-project/pull/220763