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[Concepts] Deprecate -fconcepts-ts, enable Concepts under -std=c++2a

Authored by saar.raz on Jan 23 2020, 2:43 PM.

Description

[Concepts] Deprecate -fconcepts-ts, enable Concepts under -std=c++2a

Now with concepts support merged and mostly complete, we do not need -fconcepts-ts
(which was also misleading as we were not implementing the TS) and can enable
concepts features under C++2a. A warning will be generated if users still attempt
to use -fconcepts-ts.