[x86] Add an SSSE3 run and check mode to the 128-bit v2 tests of the new vector shuffle lowering. This will be needed for up-coming palignr tests.
[x86] Add an SSSE3 run and check mode to the 128-bit v2 tests of the new
vector shuffle lowering. This will be needed for up-coming palignr
tests.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@218037 91177308-0d34-0410-b5e6-96231b3b80d8

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