* builtins.c (expand_builtin, expand_builtin_object_size,
	expand_builtin_memory_chk, maybe_emit_chk_warning,
	maybe_emit_sprintf_chk_warning): Use new %K format string specifier
	for diagnostics.
	* expr.c (expand_expr_real_1): Likewise.
	* langhooks-def.h (struct diagnostic_info): Add forward decl.
	(lhd_print_error_function): Add third argument.
	* langhooks.h (struct diagnostic_info): Add forward decl.
	(struct lang_hooks): Add third argument to print_error_function.
	* diagnostic.h (diagnostic_info): Add abstract_origin field.
	(diagnostic_last_function_changed, diagnostic_set_last_function): Add
	second argument.
	(diagnostic_report_current_function): Likewise.
	* toplev.c (announce_function): Pass NULL as second argument to
	diagnostic_set_last_function.
	* diagnostic.c (diagnostic_report_current_function): Add second
	argument, pass it as third argument to lang_hooks.print_error_function.
	(default_diagnostic_starter): Pass DIAGNOSTIC as second argument
	to diagnostic_report_current_function.
	(diagnostic_report_diagnostic): Initialize diagnostic->abstract_origin
	and message.abstract_origin.
	(verbatim): Initialize abstract_origin.
	* pretty-print.h (text_info): Add abstract_origin field.
	* pretty-print.c (pp_base_format): Handle %K.
	* langhooks.c (lhd_print_error_function): Add third argument.  If
	diagnostic->abstract_origin, print virtual backtrace.
	* c-format.c (gcc_diag_char_table, gcc_tdiag_char_table,
	gcc_cdiag_char_table, gcc_cxxdiag_char_table): Support %K.
	(init_dynamic_diag_info): Likewise.
cp/
	* error.c (cxx_print_error_function): Add third argument, pass
	it over to lhd_print_error_function.
	(cp_print_error_function): If diagnostic->abstract_origin, print
	virtual backtrace.
	* cp-tree.h (struct diagnostic_info): New forward decl.
	(cxx_print_error_function): Add third argument.
java/
	* lang.c (java_print_error_function): Add third argument.
testsuite/
	* lib/prune.exp: Prune also "^In function .*$" lines and
	"^    inlined from .*$" lines.

From-SVN: r128830