C++ PATCH for c++/69753 (DR141 broke member template lookup)

[Jason Merrill]

When we stopped finding function templates with unqualified lookup due 
to the DR141 fix, that exposed bugs in our lookup within the object 
expression scope; an object-expression of the current instantiation does 
not make the expression dependent.  This patch fixes this issue 
specifically for implicit "this->", which is the case in question in 
this PR; addressing this issue more generally will take more work.

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