PR tree-optimization/93247 - ICE in get_load_store_type

My earlier update_epilogue_loop_vinfo patch introduced an ICE on these
tests for AVX512.  If we use pattern stmts, STMT_VINFO_GATHER_SCATTER_P
is valid for both the original stmt and the pattern stmt, but
STMT_VINFO_MEMORY_ACCESS_TYPE is valid only for the latter.

2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR tree-optimization/93247
	* tree-vect-loop.c (update_epilogue_loop_vinfo): Check the access
	type of the stmt that we're going to vectorize.

gcc/testsuite/
	PR tree-optimization/93247
	* gcc.dg/vect/pr93247-1.c: New test.
	* gcc.dg/vect/pr93247-2.c: Likewise.

gcc/ChangeLog

 2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>
 
+	PR tree-optimization/93247
+	* tree-vect-loop.c (update_epilogue_loop_vinfo): Check the access
+	type of the stmt that we're going to vectorize.
+
+2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* tree-vect-slp.c (vectorize_slp_instance_root_stmt): Use a
 	VIEW_CONVERT_EXPR if the vectorized constructor has a diffeent
 	type from the lhs.

gcc/testsuite/ChangeLog

+2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR tree-optimization/93247
+	* gcc.dg/vect/pr93247-1.c: New test.
+	* gcc.dg/vect/pr93247-2.c: Likewise.
+
 2020-01-15  Martin Sebor  <msebor@redhat.com>
 
 	* gcc.dg/Wstringop-overflow-17.c: Tweak test to avoid unrelated

gcc/testsuite/gcc.dg/vect/pr93247-1.c

+/* { dg-do compile } */
+/* { dg-additional-options "-march=skylake" { target x86_64-*-* i?86-*-* } } */
+
+typedef struct {
+  unsigned num;
+} VEC_tree_base;
+
+enum {
+  LTO_DECL_STREAM_NAMESPACE_DECL,
+  LTO_DECL_STREAM_LABEL_DECL,
+  LTO_N_DECL_STREAMS
+};
+
+struct lto_tree_ref_encoder {
+  VEC_tree_base *trees;
+} typedef *lto_out_decl_state_ptr;
+
+typedef struct {
+  lto_out_decl_state_ptr vec[1];
+} VEC_lto_out_decl_state_ptr_base;
+
+VEC_lto_out_decl_state_ptr_base *a;
+int f;
+long g;
+int
+fn1(struct lto_tree_ref_encoder *p1) {
+  int i;
+  long b;
+  i = 0;
+  for (; i < LTO_N_DECL_STREAMS; i++) {
+    struct lto_tree_ref_encoder c = *p1;
+    int d;
+    VEC_tree_base *e = c.trees;
+    d = e ? e->num : 0;
+    b += d;
+  }
+  return b;
+}
+int
+fn2() {
+  lto_out_decl_state_ptr h;
+  struct lto_tree_ref_encoder j;
+  unsigned k;
+  for (; k < f; k++) {
+    h = a->vec[k];
+    j = *h;
+    g += fn1(&j);
+  }
+}

gcc/testsuite/gcc.dg/vect/pr93247-2.c

+/* { dg-do compile } */
+/* { dg-additional-options "-march=skylake-avx512" { target x86_64-*-* i?86-*-* } } */
+
+int
+foo (int *a, double *b, int *c)
+{
+  int f, g = 0;
+  for (f = 0; f < 100; f++)
+    if (b[f] && c[a[f]])
+      g++;
+  return g;
+}

gcc/tree-vect-loop.c

@@ -8452,7 +8452,8 @@ update_epilogue_loop_vinfo (class loop *epilogue, tree advance)
 	 updated offset we set using ADVANCE.  Instead we have to make sure the
 	 reference in the data references point to the corresponding copy of
 	 the original in the epilogue.  */
-      if (STMT_VINFO_MEMORY_ACCESS_TYPE (stmt_vinfo) == VMAT_GATHER_SCATTER)
+      if (STMT_VINFO_MEMORY_ACCESS_TYPE (vect_stmt_to_vectorize (stmt_vinfo))
+	  == VMAT_GATHER_SCATTER)
 	{
 	  DR_REF (dr)
 	    = simplify_replace_tree (DR_REF (dr), NULL_TREE, NULL_TREE,