add make-target-delegates

add make-target-delegates

This patch adds a new script, call make-target-delegates, which
auto-generates some target delegation code based on annotations in
target.h.  This adds the new delegation macros, the new generated
file, and adds the necessary calls to the new generated functions to
target.c.  It doesn't, however, add any actual annotations to the
target methods, leaving these for separate patches.

2014-02-19  Tom Tromey  <tromey@redhat.com>

	PR build/7701:
	* target-delegates.c: New file.
	* target.c: Include target-delegates.c.
	(init_dummy_target): Call install_dummy_methods.
	(complete_target_initialization): Call install_delegators.
	* target.h (TARGET_DEFAULT_IGNORE, TARGET_DEFAULT_NORETURN)
	(TARGET_DEFAULT_RETURN, TARGET_DEFAULT_FUNC): New defines.
	* make-target-delegates: New file.