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[X86] Add support for matching vector funnel shift to AVX512VBMI2 instructions.

Authored by craig.topper on Jan 6 2019, 10:10 AM.

Description

[X86] Add support for matching vector funnel shift to AVX512VBMI2 instructions.

Summary: AVX512VBMI2 supports a funnel shift by immediate and a funnel shift by a variable vector.

Reviewers: spatel, RKSimon

Reviewed By: RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D56361

llvm-svn: 350498