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[X86] Add vector element insertion/extraction scheduler classes

Authored by RKSimon on Apr 24 2018, 6:21 AM.

Description

[X86] Add vector element insertion/extraction scheduler classes

Split off pinsr/pextr and extractps instructions.

(Mostly) fixes PR36887.

Note: It might be worth adding a WriteFInsertLd class as well in the future.

Differential Revision: https://reviews.llvm.org/D45929

llvm-svn: 330714