[x86] Inline an SSE4 helper function for INSERT_VECTOR_ELT lowering, no functionality changed.
[x86] Inline an SSE4 helper function for INSERT_VECTOR_ELT lowering, no
functionality changed.

Separating this into two functions wasn't helping. There was a decent
amount of boilerplate duplicated, and some subsequent refactorings here
will pull even more common code out.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@216644 91177308-0d34-0410-b5e6-96231b3b80d8

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