[C++14 PATCH] Do not diagnose lambda default arguments in c++14 modes.

[Ville Voutilainen]

Tested on Linux-x64.

/cp
2014-09-14  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Do not diagnose lambda default arguments in c++14 modes.
    * parser.c (cp_parser_lambda_declarator_opt): Make the pedwarn conditional.

/testsuite
2014-09-14  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Do not diagnose lambda default arguments in c++14 modes.
    * g++.dg/cpp0x/lambda/lambda-defarg.C: Enable in c++11_only.
    * g++.dg/cpp1y/lambda-defarg.C: New.
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