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[MLIR] Remove all-reduce lowering from GPU to NVVM. Use in-dialect lowering…

Authored by csigg on Mar 9 2020, 6:42 AM.

Description

[MLIR] Remove all-reduce lowering from GPU to NVVM. Use in-dialect lowering instead.

Reviewers: herhut, mravishankar

Reviewed By: herhut

Subscribers: merge_guards_bot, jholewinski, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, nicolasvasilache, arpith-jacob, mgester, lucyrfox, aartbik, liufengdb, Joonsoo, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D73794