defaults.h (ASM_OUTPUT_MEASURED_SIZE): Take only two arguments.

	* defaults.h (ASM_OUTPUT_MEASURED_SIZE): Take only two
	arguments.  Always use ".-symbol" as expression argument.
	* doc/tm.texi: Update to match.  Document requirement for
	".size symbol, .-symbol" to be acceptable to assembler.

	* config/elfos.h, config/netbsd-aout.h, config/openbsd.h,
	config/arm/elf.h, config/avr/avr.h, config/cris/aout.h,
	config/i386/freebsd-aout.h, config/i386/sco5.h,
	config/ip2k/ip2k.h, config/m88k/m88k.h, config/xtensa/elf.h,
	config/xtensa/linux.h:  Update uses of ASM_OUTPUT_MEASURED_SIZE.

From-SVN: r55820