re PR middle-end/79505 (Memory leaks in oacc_loop_discover_walk)

	PR middle-end/79505
	* omp-offload.c (free_oacc_loop): Release loop->ifns vector.
	(new_oacc_loop_raw): Don't clear already cleared fields.

From-SVN: r245445

gcc/ChangeLog

 2017-02-14  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/79505
+	* omp-offload.c (free_oacc_loop): Release loop->ifns vector.
+	(new_oacc_loop_raw): Don't clear already cleared fields.
+
 	PR target/79481
 	* config/i386/avx512pfintrin.h (_mm512_prefetch_i32gather_pd,
 	_mm512_prefetch_i32gather_ps, _mm512_prefetch_i64gather_pd,

gcc/omp-offload.c

@@ -681,7 +681,6 @@ new_oacc_loop_raw (oacc_loop *parent, location_t loc)
   oacc_loop *loop = XCNEW (oacc_loop);
 
   loop->parent = parent;
-  loop->child = loop->sibling = NULL;
 
   if (parent)
     {
@@ -690,15 +689,6 @@ new_oacc_loop_raw (oacc_loop *parent, location_t loc)
     }
 
   loop->loc = loc;
-  loop->marker = NULL;
-  memset (loop->heads, 0, sizeof (loop->heads));
-  memset (loop->tails, 0, sizeof (loop->tails));
-  loop->routine = NULL_TREE;
-
-  loop->mask = loop->e_mask = loop->flags = loop->inner = 0;
-  loop->chunk_size = 0;
-  loop->head_end = NULL;
-
   return loop;
 }
 
@@ -773,6 +763,7 @@ free_oacc_loop (oacc_loop *loop)
   if (loop->child)
     free_oacc_loop (loop->child);
 
+  loop->ifns.release ();
   free (loop);
 }