testsuite: Fix up sse2-v1ti-shift-3.c test [PR102986]

testsuite: Fix up sse2-v1ti-shift-3.c test [PR102986]

This test is dg-do run and invokes UB when these rotate functions
are called with 0 as second argument.  There are some other tests
that do this but they are dg-do compile only and not even call those
functions at all, so it IMHO doesn't matter that they are only well
defined for [1,127] and not [0,127].

The following patch fixes it, we pattern recognize both forms as rotates
and we emit identical assembly.

2022-03-23  Jakub Jelinek  <jakub@redhat.com>

	PR target/102986
	* gcc.target/i386/sse2-v1ti-shift-3.c (rotr_v1ti, rotl_v1ti, rotr_ti,
	rotl_ti): Use -i&127 instead of 128-i to avoid UB on i == 0.