[clang] [clang][test] Use `FileCheck` in `Rewriter/objc-modern-getclass-proto.mm` (PR #204272)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Fady Farag (iidmsa)

<details>
<summary>Changes</summary>

The test had `CHECK` directives that were never executed because no `RUN` line invoked `FileCheck` on the output.

The test also used a fragile runtime, which invoked the fragile rewriter instead of the modern one the test was written for.

Switch to a non-fragile runtime so the modern rewriter runs as the test intended.

---
Full diff: https://github.com/llvm/llvm-project/pull/204272.diff


1 Files Affected:

- (modified) clang/test/Rewriter/objc-modern-getclass-proto.mm (+2-1) 


``````````diff
diff --git a/clang/test/Rewriter/objc-modern-getclass-proto.mm b/clang/test/Rewriter/objc-modern-getclass-proto.mm
index da417477aa12b..81947460b4cfb 100644
--- a/clang/test/Rewriter/objc-modern-getclass-proto.mm
+++ b/clang/test/Rewriter/objc-modern-getclass-proto.mm
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 -E %s -o %t.mm
-// RUN: %clang_cc1 -x objective-c++ -fblocks -fms-extensions -rewrite-objc -fobjc-runtime=macosx-fragile-10.5 %t.mm -o %t-rw.cpp
+// RUN: %clang_cc1 -x objective-c++ -fblocks -fms-extensions -rewrite-objc -fobjc-runtime=macosx-10.7 %t.mm -o %t-rw.cpp
+// RUN: FileCheck --input-file=%t-rw.cpp %s
 
 @interface I @end
 @implementation I @end

``````````

</details>


https://github.com/llvm/llvm-project/pull/204272