Add 'gpu.terminator' operation.

Authored by Stephan Herhut <herhut@google.com> on Jan 29 2020, 4:59 AM.


Add 'gpu.terminator' operation.

The 'gpu.terminator' operation is used as the terminator for the
regions of gpu.launch. This is to disambugaute them from the
return operation on 'gpu.func' functions.

This is a breaking change and users of the gpu dialect will need
to adapt their code when producting 'gpu.launch' operations.

Reviewers: nicolasvasilache

Subscribers: mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, csigg, arpith-jacob, mgester, lucyrfox, liufengdb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D73620

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Can you please clear the Phabricator tags from the commit message in the future?