revert: gimplify.c (gimplify_expr): Drop TREE_OVERFLOW from INTEGER_CSTs.

	Revert:
	2008-10-21  Jakub Jelinek  <jakub@redhat.com>
	* gimplify.c (gimplify_expr): Drop TREE_OVERFLOW from
	INTEGER_CSTs.

From-SVN: r141802

gcc/ChangeLog

+2008-11-12  Jakub Jelinek  <jakub@redhat.com>
+
+	Revert:
+	2008-10-21  Jakub Jelinek  <jakub@redhat.com>
+	* gimplify.c (gimplify_expr): Drop TREE_OVERFLOW from
+	INTEGER_CSTs.
+
 2008-11-12  Jason Merrill  <jason@redhat.com>
 
 	PR c++/38007

gcc/gimplify.c

@@ -6441,16 +6441,6 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 
 	  /* Constants need not be gimplified.  */
 	case INTEGER_CST:
-	  /* Don't preserve TREE_OVERFLOW flags, it only inhibits
-	     many optimizations and FEs should have taken care of
-	     reporting all the required diagnostics.  */
-	  if (TREE_OVERFLOW (*expr_p))
-	    *expr_p = build_int_cst_wide (TREE_TYPE (*expr_p),
-					  TREE_INT_CST_LOW (*expr_p),
-					  TREE_INT_CST_HIGH (*expr_p));
-	  ret = GS_ALL_DONE;
-	  break;
-
 	case REAL_CST:
 	case FIXED_CST:
 	case STRING_CST: