[Concepts] lex keywords: concept and requires

Description

[Concepts] lex keywords: concept and requires

Summary:
This patch enables lexing of concept and requires as keywords.
Further changes which add messages for future keyword compat are to
follow.

Test Plan:
Testing of C++14 + Concepts TS mode is added to
test/Lexer/keywords_test.cpp, which expects that the new keywords are
enabled under said mode.

Reviewers: faisalv, fraggamuffin, rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D10233

Details

Committed
hubert.reinterpretcastJun 4 2015, 6:10 PM
Reviewer
rsmith
Differential Revision
D10233: [Concepts] lex keywords: concept and requires
Parents
rL239127: Delegate path operations to FileSpec.
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