add default for NO_FUNCTION_CSE

add default for NO_FUNCTION_CSE

gcc/ChangeLog:

2015-04-27  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* calls.c (prepare_call_address): Remove ifdef NO_FUNCTION_CSE.
	* cse.c (fold_rtx): Likewise.
	* config/alpha/alpha.h (NO_FUNCTION_CSE): Define to 1.
	* config/arc/arc.h (NO_FUNCTION_CSE): Likewise.
	* config/avr/avr.h (NO_FUNCTION_CSE): Likewise.
	* config/cr16/cr16.h (NO_FUNCTION_CSE): Likewise.
	* config/epiphany/epiphany.h (NO_FUNCTION_CSE): Likewise.
	* config/frv/frv.h (NO_FUNCTION_CSE): Likewise.
	* config/h8300/h8300.h (NO_FUNCTION_CSE): Likewise.
	* config/i386/i386.h (NO_FUNCTION_CSE): Likewise.
	* config/ia64/ia64.h (NO_FUNCTION_CSE): Likewise.
	* config/lm32/lm32.h (enum reg_class) (NO_FUNCTION_CSE):
	* Likewise.
	* config/m32r/m32r.h (NO_FUNCTION_CSE): Likewise.
	* config/mep/mep.h (NO_FUNCTION_CSE): Likewise.
	* config/mn10300/mn10300.h (NO_FUNCTION_CSE): Likewise.
	* config/nds32/nds32.h (NO_FUNCTION_CSE): Likewise.
	* config/nios2/nios2.h (NO_FUNCTION_CSE): Likewise.
	* config/pa/pa.h (NO_FUNCTION_CSE): Likewise.
	* config/rs6000/rs6000.h (NO_FUNCTION_CSE): Likewise.
	* config/s390/s390.h (NO_FUNCTION_CSE): Likewise.
	* config/sparc/sparc.h (NO_FUNCTION_CSE): Likewise.
	* config/spu/spu.h (NO_FUNCTION_CSE): Likewise.
	* config/stormy16/stormy16.h (NO_FUNCTION_CSE): Likewise.
	* config/v850/v850.h (NO_FUNCTION_CSE): Likewise.
	* defaults.h (NO_FUNCTION_CSE): Provide default definition to 0.
	* doc/tm.texi: Regenerate.
	* doc/tm.texi.in: Document NO_FUNCTION_CSE is always defined to
	either true or false.

From-SVN: r222501