bb-reorder.c: Don't include obstack.h if backend.h is included.

bb-reorder.c: Don't include obstack.h if backend.h is included.

	* bb-reorder.c: Don't include obstack.h if backend.h is included.
	* cfg.c: Likewise.
	* cfgloopanal.c: Likewise.
	* cfgrtl.c: Likewise.
	* combine.c: Likewise.
	* cprop.c: Likewise.
	* dominance.c: Likewise.
	* fwprop.c: Likewise.
	* gcse.c: Likewise.
	* ira-emit.c: Likewise.
	* ira.c: Likewise.
	* loop-init.c: Likewise.
	* loop-invariant.c: Likewise.
	* loop-iv.c: Likewise.
	* loop-unroll.c: Likewise.
	* lower-subreg.c: Likewise.
	* postreload-gcse.c: Likewise.
	* postreload.c: Likewise.
	* regcprop.c: Likewise.
	* regrename.c: Likewise.
	* reload1.c: Likewise.
	* reorg.c: Likewise.
	* tree-ssa-pre.c: Likewise.
	* tree-ssa-structalias.c: Likewise.
	* tree.c: Likewise.
	* web.c: Likewise.
	* config/aarch64/cortex-a57-fma-steering.c: Likewise.
	* config/alpha/alpha.c: Likewise.
	* config/arm/arm.c: Likewise.
	* config/avr/avr.c: Likewise.
	* config/darwin.c: Likewise.
	* config/fr30/fr30.c: Likewise.
	* config/frv/frv.c: Likewise.
	* config/ft32/ft32.c: Likewise.
	* config/m32c/m32c.c: Likewise.
	* config/mcore/mcore.c: Likewise.
	* config/mep/mep.c: Likewise.
	* config/mn10300/mn10300.c: Likewise.
	* config/moxie/moxie.c: Likewise.
	* config/rs6000/rs6000.c: Likewise.
	* config/spu/spu.c: Likewise.
	* config/stormy16/stormy16.c: Likewise.

From-SVN: r225689