cp:
	* pt.c (coerce_template_parms): Refactor.
	(fn_type_unification): Increment processing_template_decl when
	tsubsting an incomplete set of explicit args.
testsuite:
	* g++.dg/template/explicit3.C: New.
	* g++.dg/template/explicit4.C: New.
	* g++.dg/template/explicit5.C: New.

From-SVN: r69995