C++ PATCH for c++/66387 (error with lambda and constexpr array)

[Jason Merrill]

On 06/10/2015 09:01 AM, Jason Merrill wrote:
> My change to rationalize the *_constant_value functions broke this
> testcase, because we were no longer replacing the reference to the array
> with its constant value.  Fixed by using maybe_constant_value instead.

We need to deal with this properly in tsubst_copy, as well.  Fixed by 
calling process_outer_var_ref.

Tested x86_64-pc-linux-gnu, applying to trunk and 5.


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