re PR c++/77585 (g++ incorrectly decides that member function is called without object in generic lambda)

	PR c++/77585
	* pt.c (instantiate_decl): Push to class scope lambda resides
	within when instantiating a generic lambda function.

	PR c++/77585
	* g++.dg/cpp1y/pr77585.C: New.

From-SVN: r243723