inliner: Don't ICE on NULL TYPE_DOMAIN [PR94621]

When I've added the VLA tweak for OpenMP to avoid error_mark_nodes in the IL in
type, I forgot that TYPE_DOMAIN could be NULL.  Furthermore, as an optimization,
this patch checks the hopefully cheapest condition that is very likely false
most of the time (enabled only during OpenMP handling) first.

2020-04-17  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/94621
	* tree-inline.c (remap_type_1): Don't dereference NULL TYPE_DOMAIN.
	Move id->adjust_array_error_bounds check first in the condition.

	* gcc.c-torture/compile/pr94621.c: New test.

gcc/ChangeLog

+2020-04-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/94621
+	* tree-inline.c (remap_type_1): Don't dereference NULL TYPE_DOMAIN.
+	Move id->adjust_array_error_bounds check first in the condition.
+
 2020-04-17  Martin Liska  <mliska@suse.cz>
 	    Jonathan Yong <10walls@gmail.com>
 

gcc/testsuite/ChangeLog

 2020-04-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/94621
+	* gcc.c-torture/compile/pr94621.c: New test.
+
 	PR c++/94314
 	* g++.dg/pr94314-4.C: Require c++14 rather than c++11.
 

gcc/testsuite/gcc.c-torture/compile/pr94621.c

+/* PR tree-optimization/94621 */
+
+struct S { int c, e[]; };
+
+static inline int
+foo (struct S *m, int r, int c)
+{
+  int (*a)[][m->c] = (int (*)[][m->c])&m->e;
+  return (*a)[r][c];
+}
+
+void
+bar (struct S *a)
+{
+  foo (a, 0, 0);
+}

gcc/tree-inline.c

@@ -556,8 +556,9 @@ remap_type_1 (tree type, copy_body_data *id)
 	  /* For array bounds where we have decided not to copy over the bounds
 	     variable which isn't used in OpenMP/OpenACC region, change them to
 	     an uninitialized VAR_DECL temporary.  */
-	  if (TYPE_MAX_VALUE (TYPE_DOMAIN (new_tree)) == error_mark_node
-	      && id->adjust_array_error_bounds
+	  if (id->adjust_array_error_bounds
+	      && TYPE_DOMAIN (new_tree)
+	      && TYPE_MAX_VALUE (TYPE_DOMAIN (new_tree)) == error_mark_node
 	      && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) != error_mark_node)
 	    {
 	      tree v = create_tmp_var (TREE_TYPE (TYPE_DOMAIN (new_tree)));