[X86] Add a test for a 128-bit vector load feeding a cvtph2ps intrinsic.
[X86] Add a test for a 128-bit vector load feeding a cvtph2ps intrinsic.

The instruction only loads 64-bits, but we should be able to fold a wider load and let it be narrowed.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@317546 91177308-0d34-0410-b5e6-96231b3b80d8

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