pt.c (tinst_level_tick, [...]): Replace with last_error_tinst_level.

pt.c (tinst_level_tick, [...]): Replace with last_error_tinst_level.

gcc/cp/
	* pt.c (tinst_level_tick, last_template_error_tick): Replace with
	last_error_tinst_level.
	(push_tinst_level, pop_tinst_level): Adjust.
	(problematic_instantiation_changed): Adjust.
	(record_last_problematic_instantiation): Adjust.
	* error.c (cp_print_error_function): Don't print
	current_function_decl if we're in a template instantiation context.
	(print_instantiation_full_context): Always print first line.
gcc/testsuite/
	* lib/prune.exp (prune_gcc_output): Prune "In substitution" too.

From-SVN: r176366