[PATCH] [Concepts] Parsing of requires-clause in template-declaration

[Hubert Tong]

Hi rsmith, faisalv, fraggamuffin,

This change implements parse-only acceptance of the optional
requires-clause in a template-declaration. Diagnostic testing is added
for cases where the grammar is ambiguous with the expectation that the
longest token sequence which matches the syntax of a
constraint-expression is consumed without backtracking.

http://reviews.llvm.org/D10462

Files:
  include/clang/Parse/Parser.h
  lib/Parse/ParseExpr.cpp
  lib/Parse/ParseTemplate.cpp
  test/Parser/cxx-concepts-ambig-constraint-expr.cpp

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