fixed bug #845089

	fixed bug #845089
	* src/SDCCbitv.h,
	* src/SDCCbitv.c: added function to free a bitvector
	* src/SDCClrange.h,
	* src/SDCClrange.c: added function to recompute the liveranges
	* src/avr/ralloc.c,
	* src/ds390/ralloc.c,
	* src/hc08/ralloc.c,
	* src/mcs51/ralloc.c,
	* src/pic/ralloc.c,
	* src/pic16/ralloc.c,
	* src/xa51/ralloc.c,
	* src/z80/ralloc.c: recompute the liveranges after register packing

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3025 4a8a32a2-be11-0410-ad9d-d568d2c75423