* device/lib/mcs51/crtcall.asm: new, added for indirect calls

* device/lib/mcs51/crtcall.asm: new, added for indirect calls
* device/lib/mcs51/crtclear.asm,
* device/lib/mcs51/crtxclear.asm: renumbered labels
* device/lib/mcs51/Makefile.in: added crtcall.asm
* doc/sdccman.lyx: documented mcs51 crt* library startup code
* src/mcs51/gen.c (movc): removed,
  (aopGet, genPlusBits): clear a after loading the carry (possibly from
    acc.x or psw.x),
  (toCarry, genSend, genRet): added function toCarry,
  (genPcall): use "lcall @a+dptr" for functions w/o parameters,
  (assignBit, genAssign, genCast): added function assignBit
* src/mcs51/Makefile.bcc: added rtrack.c
* src/mcs51/ralloc.h: made valueKnown a bitfield
* src/mcs51/rtrack.c (getReg, rtrackUpdate): added getReg,
  fixed "jbc acc" and "cpl acc" bug, enhanced "cjne", "jnz" and "djnz",
  disabled InvalidateAllRx for lcall __gptrput, added "xch a,rn"
* src/pic/pcode.c (FixRegisterBanking): fixed warning used uninitialized
* src/z80/gen.c: added AOP_IS_PAIRPTR,
  (_pop): only pop valid pairs, see gencjneshort,
  (gencjneshort): return pair that still needs to be popped, restructured,
  (gencjne, genCmpEq): call _pop

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4651 4a8a32a2-be11-0410-ad9d-d568d2c75423