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[AMDGPU][MC][GFX9] Added instructions *saveexec*, *wrexec* and *bitreplicate*

Authored by dp on Apr 6 2018, 9:35 AM.

Description

[AMDGPU][MC][GFX9] Added instructions *saveexec*, *wrexec* and *bitreplicate*

See bug 36840: https://bugs.llvm.org/show_bug.cgi?id=36840

Differential Revision: https://reviews.llvm.org/D45250

Reviewers: artem.tamazov, arsenm, timcorringham
llvm-svn: 329419