C++ PATCH for c++/52282

[Jason Merrill]

I've started going through the constexpr blocker bug to try and clear up 
remaining problems.  For this bug, the issue wasn't really a problem 
with the constexpr implementation, but with our pointer to member 
function handling: a const PMF (e.g. void (A::* const)()) is a distinct 
RECORD_TYPE from the cv-unqualified variant, so the __pfn member is 
different in the two records, and trying to look up the const member in 
the non-const initializer for the PMF variable fails.  It seems to me 
that a const PMF should just be a const variant of the PMF for the 
unqualified pointer-to-member, and making that change seems to work fine.

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