C++ PATCH to build_new_method_call for c++/26577

[Jason Merrill]

In this PR, a call to a static member function from within a volatile 
non-static member function was reformed to

   *this, A::bar();

causing the backend to try to copy *this to a temporary, which lead to 
an abort in cp_expr_size.  The bug is in the translation above: a call 
to a static member function should not imply a dereference of 'this'.

Fixed by forcing evaluation of the object pointer, not the object itself.

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