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[AMDGPU] Added a new metadata for multi grid sync implicit argument

Authored by yaxunl on Jul 5 2019, 9:05 AM.

Description

[AMDGPU] Added a new metadata for multi grid sync implicit argument

Patch by Christudasan Devadasan.

Differential Revision: https://reviews.llvm.org/D63886

llvm-svn: 365217