remove unnecessary comment

Author: balazske

clang/test/Analysis/ArrayBound/verbose-tests.c

@@ -408,9 +408,5 @@ int *nothingIsCertain(int x, int y) {
   //   {{Access of 'int' element in the heap area at an overflowing index}}
   // but apparently the analyzer isn't smart enough to deduce this.
 
-  // Keep constraints alive. (Without this, it is possible that the overeager
-  // garbage collection of constraints _also_ prevents the intended behavior in
-  // this testcase.)
-
   return mem;
 }