[X86] Greatly simplify the llvm.x86.avx.vpermil.* auto-upgrade code. We can fully derive everything using types of the intrinsic arguments rather than writing separate loops for each intrinsic. NFC
[X86] Greatly simplify the llvm.x86.avx.vpermil.* auto-upgrade code. We can fully derive everything using types of the intrinsic arguments rather than writing separate loops for each intrinsic. NFC

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@272496 91177308-0d34-0410-b5e6-96231b3b80d8

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