[clang] [analyzer][NFC] Add xrefs to a test case that has poor git blame (PR #145501)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-static-analyzer-1

Author: Balázs Benics (balazs-benics-sonarsource)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/145501.diff


1 Files Affected:

- (modified) clang/test/Analysis/PR38208.c (+5) 


``````````diff
diff --git a/clang/test/Analysis/PR38208.c b/clang/test/Analysis/PR38208.c
index fb0a5a15eac6b..750cbc50cc749 100644
--- a/clang/test/Analysis/PR38208.c
+++ b/clang/test/Analysis/PR38208.c
@@ -2,6 +2,11 @@
 
 // expected-no-diagnostics
 
+// This test case used to demonstrate a huge slowdown regression.
+// Reported in https://bugs.llvm.org/show_bug.cgi?id=38208
+// Caused by 2bbccca9f75b6bce08d77cf19abfb206d0c3bc2e aka. "aggressive-binary-operation-simplification"
+// Fixed by dcde8acc32f1355f37d3bc2814c528fdc2ca5f94
+
 int foo(int a, int b) {
   a += b; b -= a;
   a += b; b -= a;

``````````

</details>


https://github.com/llvm/llvm-project/pull/145501