gcc/fix-ICE-IPA-compare-VRP-types.patch

This backport contains 1 patch from gcc main stream tree.
The commit id of these patchs list as following in the order of time.

0001-IPA-compare-VRP-types.patch
a86623902767122c71c7229150a8b8a79cbb3673

diff -Nurp a/gcc/ipa-prop.c b/gcc/ipa-prop.c
--- a/gcc/ipa-prop.c	2020-11-28 00:19:34.340000000 +0800
+++ b/gcc/ipa-prop.c	2020-11-28 00:21:24.680000000 +0800
@@ -122,7 +122,8 @@ struct ipa_vr_ggc_hash_traits : public g
   static bool
   equal (const value_range_base *a, const value_range_base *b)
     {
-      return a->equal_p (*b);
+      return (a->equal_p (*b)
+	      && types_compatible_p (a->type (), b->type ()));
     }
   static void
   mark_empty (value_range_base *&p)
diff -Nurp a/gcc/testsuite/gcc.c-torture/execute/pr97404.c b/gcc/testsuite/gcc.c-torture/execute/pr97404.c
--- a/gcc/testsuite/gcc.c-torture/execute/pr97404.c	1970-01-01 08:00:00.000000000 +0800
+++ b/gcc/testsuite/gcc.c-torture/execute/pr97404.c	2020-11-28 00:21:24.680000000 +0800
@@ -0,0 +1,28 @@
+/* PR ipa/97404 */
+/* { dg-additional-options "-fno-inline" } */
+
+char a, b;
+long c;
+short d, e;
+long *f = &c;
+int g;
+char h(signed char i) { return 0; }
+static short j(short i, int k) { return i < 0 ? 0 : i >> k; }
+void l(void);
+void m(void)
+{
+  e = j(d | 9766, 11);
+    *f = e;
+}
+void l(void)
+{
+  a = 5 | g;
+    b = h(a);
+}
+int main()
+{
+  m();
+  if (c != 4)
+    __builtin_abort();
+  return 0;
+}