testsuite: Add further testcase for already fixed PR [PR109778]

I came up with a testcase which reproduces all the way to r10-7469.
LTO to avoid early inlining it, so that ccp handles rotates and not
shifts before they are turned into rotates.

2023-05-09  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/109778
	* gcc.dg/lto/pr109778_0.c: New test.
	* gcc.dg/lto/pr109778_1.c: New file.

(cherry picked from commit c2cf2dc9)

gcc/testsuite/gcc.dg/lto/pr109778_0.c

+/* PR tree-optimization/109778 */
+/* { dg-lto-do run } */
+/* { dg-lto-options { "-O2 -flto" } } */
+/* { dg-require-effective-target int32 } */
+
+int bar (int);
+
+__attribute__((noipa)) int
+foo (int x)
+{
+  x = bar (x);
+  x = (x << 16) | (int) ((unsigned) x >> 16);
+  return x & 0x10000000;
+}
+
+int
+main ()
+{
+  if (foo (0) || foo (-1))
+    __builtin_abort ();
+  return 0;
+}

gcc/testsuite/gcc.dg/lto/pr109778_1.c

+int
+bar (int x)
+{
+  x &= 0x22222222;
+  x |= (int) 0xf1234567U;
+  return x;
+}