Fix missed comment fix in last change.

From-SVN: r232690

gcc/simplify-rtx.c

@@ -2277,9 +2277,9 @@ simplify_binary_operation_1 (enum rtx_code code, machine_mode mode,
       if (!HONOR_SIGNED_ZEROS (mode) && trueop0 == CONST0_RTX (mode))
 	return simplify_gen_unary (NEG, mode, op1, mode);
 
-      /* (-1 - a) is ~a, unless the expression avoids symbolic constants,
-	 in which case not retaining additions and subtractions could
-	 cause invalid assembly to be produced.  */
+      /* (-1 - a) is ~a, unless the expression contains symbolic
+	 constants, in which case not retaining additions and
+	 subtractions could cause invalid assembly to be produced.  */
       if (trueop0 == constm1_rtx
 	  && !contains_symbolic_reference_p (op1))
 	return simplify_gen_unary (NOT, mode, op1, mode);