add bitvec and use sometbsaunde/bitvec

gcc/

2015-04-08  Trevor Saunders  <tbsaunde@tbsaunde.org>

	* bitvec.h: New file.
	* bitvec.c: New file.
	* Makefile.in (OBJS-libcommon): Add bitvec.o.
	* alias.c, cfganal.c, cfgbuild.c, cfgbuild.h, cfgexpand.c, cfghooks.c,
	cfghooks.h, cfgloop.c, cfgloopmanip.c, cfgloopmanip.h, cfgrtl.c,
	config/spu/spu.c, cp/vtable-class-hierarchy.c, cse.c, dce.c,
	df-core.c, dse.c, except.c, except.h, function.c, graph.c,
	graphite-sese-to-poly.c, ira-lives.c, loop-unroll.c, lower-subreg.c,
	lra-lives.c, lra.c, modulo-sched.c, recog.c, regcprop.c, reload1.c,
	sched-int.h, sched-rgn.c, sel-sched-ir.c, sel-sched.c,
	store-motion.c, tree-eh.c, tree-into-ssa.c, tree-outof-ssa.c,
	tree-ssa-dce.c, tree-ssa-live.c, tree-ssa-loop-im.c,
	tree-ssa-loop-ivcanon.c, tree-ssa-loop-manip.c,
	tree-ssa-loop-manip.h, tree-ssa-pre.c, tree-ssa-propagate.c,
	tree-ssa-reassoc.c, tree-ssa-structalias.c, tree-stdarg.c,
	tree-vect-slp.c, tree-vrp.c, var-tracking.c: Use bitvec instead
	of sbitmap.

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