Partial fix for PR c++/14160:

	Partial fix for PR c++/14160:
	* c-typeprint.c (c_type_print_base): Use TYPE_FN_FIELD_CONSTRUCTOR.
	* dwarf2read.c (dwarf2_is_constructor): New function.
	(dwarf2_add_member_fn): Use it.
	* gnu-v3-abi.c (gnuv3_pass_by_reference): Use
	TYPE_FN_FIELD_CONSTRUCTOR.
	* jv-typeprint.c (java_type_print_base): Use
	TYPE_FN_FIELD_CONSTRUCTOR.
	* gdbtypes.h (struct fn_field) <is_constructor>: New field.
	<dummy>: Shrink.
	(TYPE_FN_FIELD_CONSTRUCTOR): New macro.
testsuite
	* gdb.cp/templates.exp (test_ptype_of_templates): Update kfails.