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[AMDGPU][MC][CODEOBJECT] Added predefined symbols to access GPU minor and…

Authored by dp on Feb 8 2019, 5:51 AM.

Description

[AMDGPU][MC][CODEOBJECT] Added predefined symbols to access GPU minor and stepping numbers

Added the following Code Object v3 symbols:

.amdgcn.gfx_generation_minor
.amdgcn.gfx_generation_stepping

Reviewers: artem.tamazov, kzhuravl

Differential Revision: https://reviews.llvm.org/D57826

llvm-svn: 353515