[X86][SSE] Add SSE2/AVX2 vector rotate tests 
[X86][SSE] Add SSE2/AVX2 vector rotate tests 

Now that we're custom lowering vector rotates for SSE in general we should be testing the combines with them as well.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@334290 91177308-0d34-0410-b5e6-96231b3b80d8

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