[X86][SSE3] Just use an explicit SSE3 target attribute - not a cpu type.
[X86][SSE3] Just use an explicit SSE3 target attribute - not a cpu type.

Merged arch/target into a specific triple - we had i686 and x86_64 targets overriding each other....

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@241410 91177308-0d34-0410-b5e6-96231b3b80d8

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