C++ PATCH for c++/53788 (accepts-invalid with call to method in decltype)

[Jason Merrill]

The diagnostic for calling a non-static member function without an 
associated object depends on the form of the dummy object built by 
build_dummy_object.  If we wrap it in a NON_DEPENDENT_EXPR, then 
is_dummy_object doesn't recognize it any more.  So don't wrap it.

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