function.c (stack_protect_epilogue): Pass label to stack_protect_test, assume it emitted also the conditional branch.

	* function.c (stack_protect_epilogue): Pass label to
	stack_protect_test, assume it emitted also the conditional
	branch.
	* doc/md.texi (stack_protect_test): Adjust documentation.
	* config/i386/i386.md (stack_protect_test): Add third argument,
	emit beq with operands[2].
	* config/rs6000/rs6000.h (FRAME_GROWS_DOWNWARD): Define to
	flag_stack_protect != 0.
	* config/rs6000/rs6000.md (UNSPEC_SP_SET, UNSPEC_SP_TEST): New
	constants.
	(stack_protect_set, stack_protect_test): New expanders.
	(stack_protect_setsi, stack_protect_setdi, stack_protect_testsi,
	stack_protect_testdi): New insns.
	* config/rs6000/rs6000.c (rs6000_stack_protect_fail): New function.
	(TARGET_STACK_PROTECT_FAIL): Define.
	(rs6000_generate_compare): Handle UNSPEC_SP_TEST.

From-SVN: r101468