[X86] In LowerVectorCTPOP use ISD::ZERO_EXTEND/ISD::TRUNCATE instead of the target specific nodes.
[X86] In LowerVectorCTPOP use ISD::ZERO_EXTEND/ISD::TRUNCATE instead of the target specific nodes.

The target independent nodes will get legalized to the target specific nodes by their own legalization process. Someday I'd like to stop using a target specific for zero extends and truncates of legal types so the less places we reference the target specific opcode the better.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@320863 91177308-0d34-0410-b5e6-96231b3b80d8

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