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* [Concepts] Deprecate -fconcepts-ts, enable Concepts under -std=c++2aSaar Raz2020-01-241-2/+2
| | | | | | | | | 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. (cherry picked from commit 67c608a9695496cfc9d3fdf9d0b12b554ac6b4df)
* [Concepts] Constraint Satisfaction CachingSaar Raz2020-01-241-0/+34
Add a simple cache for constraint satisfaction results. Whether or not this simple caching would be permitted in final C++2a is currently being discussed but it is required for acceptable performance so we use it in the meantime, with the possibility of adding some cache invalidation mechanisms later. Differential Revision: https://reviews.llvm.org/D72552 (cherry picked from commit b933d37cd3774e5431b35e82187eebb59b1ff59e)
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