Merging r333497:

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r333497 | ctopper | 2018-05-29 20:38:15 -0700 (Tue, 29 May 2018) | 5 lines

[X86] Fix the names of a bunch of icelake intrinsics.

Mostly this fixes the names of all the 128-bit intrinsics to start with _mm_ instead of _mm128_ as is the convention and what the Intel docs say.

This also fixes the name of the bitshuffle intrinsics to say epi64 for 128 and 256 bit versions.
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llvm-svn: 333575