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.