[PATCH][C++] Fix PR67333

[Mikhail Maltsev]

Hi.
This patch fixes a rejects-valid bug related to volatile-qualified arguments of
constexpr functions. This is essentially a one-line change in constexpr.c.
Bootstrapped and regtested on x86_64-pc-linux-gnu. OK for trunk?

gcc/cp/ChangeLog:

2015-08-25  Mikhail Maltsev  <maltsevm@gmail.com>

        PR c++/67333
        * constexpr.c (potential_constant_expression_1): Do not reject
        volatile-qualified values, if there is no lvalue-to-rvalue conversion.

gcc/testsuite/ChangeLog:

2015-08-25  Mikhail Maltsev  <maltsevm@gmail.com>

        PR c++/67333
        * g++.dg/cpp0x/constexpr-67333.C: New test.
        * g++.dg/cpp1y/constexpr-67333.C: New test.

-- 
Regards,
    Mikhail Maltsev
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