[analyzer][NFC] Add xrefs to a test case that has poor git blame

[balazs-benics-sonarsource]

No description provided.

[llvmbot]

@llvm/pr-subscribers-clang

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

Author: Balázs Benics (balazs-benics-sonarsource)

Changes

---

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

1 Files Affected:

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

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;

[balazs-benics-sonarsource]

I wanted to look at recently of the history of this test file. I managed to dig it up, but since the git blame didn't tell me much I think it's worth to spell out these refs explicitly.