C++: underline parameters in mismatching function calls

C++: underline parameters in mismatching function calls

gcc/cp/ChangeLog:
	* call.c (get_fndecl_argument_location): New function.
	(convert_like_real): Use it  when complaining about argument type
	mismatches.
	* cp-tree.h (struct cp_parameter_declarator): Add "loc" field.
	* parser.c (make_parameter_declarator): Add "loc" param and use
	it to initialize the new field.
	(cp_parser_translation_unit): Add UNKNOWN_LOCATION for "loc" of
	the "no_parameters" parameter.
	(cp_parser_parameter_declaration_list): Set the location of the
	result of grokdeclarator to be the parameter's loc, assuming no
	errors.
	(cp_parser_parameter_declaration): Generate a location for the
	parameter and pass to make_parameter_declarator.

gcc/testsuite/ChangeLog:
	* g++.dg/diagnostic/param-type-mismatch.C: Update expected results
	to reflect highlighting of parameters; add test coverage for
	callback parameters.

From-SVN: r253096