[clang][NFC] Robustify testcase

[urnathan]

Summary

Protect this testcase from 'cleanup' appearing in metadata due to a pathname, and then spuriously failing.

I stumbled upon this as my cleanup work is in a pathname containing 'cleanups'. I'm almost inclined to apply an obvious rule :)

[jroelofs]

LGTM

clang/test/CodeGen/fixup-depth-overflow.c

void f(int x) {
   }
 
 L1:
   return;
 }
 
 // CHECK-LABEL: define {{(dso_local )?}}void @f
 // CHECK-NOT: cleanup
+// CHECK: {{^!0 = }}
+// We might see 'cleanup' as part of a pathname or versioning in metadata