[PATCH] D49120: [libc++] P0898R3 2 of 12: Implement <concepts> header

[Casey Carter via Phabricator via cfe-commits]

CaseyCarter created this revision.
CaseyCarter added reviewers: mclow.lists, EricWF.
Herald added subscribers: christof, modocache, mgorny.

Piece number two contains the header, a bunch of "add a new header" changes, and LIT config to grok tests that need concepts (Thanks to @EricWF's similar handling for coroutines which I copied shamelessly).

No tests yet, but fear not - there are 10 pieces yet to come ;)


https://reviews.llvm.org/D49120

Files:
  CMakeLists.txt
  include/CMakeLists.txt
  include/__config
  include/concepts
  include/module.modulemap
  test/libcxx/concepts/lit.local.cfg
  test/libcxx/concepts/version.pass.cpp
  test/libcxx/double_include.sh.cpp
  test/libcxx/min_max_macros.sh.cpp
  utils/libcxx/test/config.py

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