C++ PATCH for c++/85764, bogus 'this' not captured error

[Jason Merrill]

Here, because we're inside a member function, resolvable_dummy_lambda
thought we could resolve a reference to 'this'.  But because it's a
static member function, we can't.  Using nonlambda_method_basetype
instead of current_nonlambda_class_type fixes that, but then I needed
to improve n_m_b to handle NSDMI context.

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