c++: Function type and parameter type disagreements [PR92010]

c++: Function type and parameter type disagreements [PR92010]

This resolves parts of Core issues 1001/1322 by rebuilding the function type
of an instantiated function template in terms of its formal parameter types
whenever the original function type and formal parameter types disagree about
the type of a parameter after substitution.

gcc/cp/ChangeLog:

	Core issues 1001 and 1322
	PR c++/92010
	* pt.c (rebuild_function_or_method_type): Split function out from ...
	(tsubst_function_type): ... here.
	(maybe_rebuild_function_decl_type): New function.
	(tsubst_function_decl): Use it.

gcc/testsuite/ChangeLog:

	Core issues 1001 and 1322
	PR c++/92010
	* g++.dg/cpp2a/lambda-uneval11.c: New test.
	* g++.dg/template/array33.C: New test.
	* g++.dg/template/array34.C: New test.
	* g++.dg/template/defarg22.C: New test.