teach delay folding in c++ about OACC_LOOPs

[Cesar Philippidis]

Jason,

Your recent delay folding patch broke libgomp.oacc-c++/loop-auto-1.c. It
looks like you forgot to handle OACC_LOOP in cp_fold_r. You probably
didn't notice this because Nathan committed his auto acc loop patch just
before you applied your patch. I'm not sure why only that test is
affected though.

Is this patch ok for trunk?

Cesar

2015-11-17  Cesar Philippidis  <ce...@codesourcery.com>

	gcc/cp/
	* cp-gimplify.c (cp_fold_r): Add support for OACC_LOOP.

diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index 8fe9e13..99d0cfb 100644
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -933,7 +933,8 @@ cp_fold_r (tree *stmt_p, int *walk_subtrees, void *data)
 
   code = TREE_CODE (stmt);
   if (code == OMP_FOR || code == OMP_SIMD || code == OMP_DISTRIBUTE
-      || code == OMP_TASKLOOP || code == CILK_FOR || code == CILK_SIMD)
+      || code == OMP_TASKLOOP || code == CILK_FOR || code == CILK_SIMD
+      || code == OACC_LOOP)
     {
       tree x;
       int i, n;