* device/include/malloc.h: removed redundant __reentrant prototypes

* device/include/malloc.h: removed redundant __reentrant prototypes
* device/lib/_mullong.c: added working xstack variant in asm (C version
  doesn't pass regression tests)
* device/lib/bpx.c: used __data and made bpx char for mcs51
* src/SDCCast.c (decorateType): removed unused GPTYPE_IDATA,
  (createFunction): fixed bug with xstackPtr
* src/SDCCcse.c: corrected comments
* src/SDCCopt.c (convertToFcall): fixed warning in MSVC,
  (killDeadCode, eBBlockFromiCode): removed unused code
* src/SDCCsymt.h: removed unused GPTYPE_GPTR and GPTYPE_IDATA,
  corrected comments
* src/mcs51/gen.c (aopForSym, aopPut, toBoolean, unsaveRegisters,
  assignResultValue, genCall, genFunction, genEndFunction, genAnd,
  genOr, genXor, genAddrOf): fixed several bugs concerning xstack
  (genModOneByte): fixed warning in MSVC
* src/mcs51/main.c (): added comments
* src/mcs51/peeph.def: changed 129 to 129.a, added 129.b, 129.c & 129.d

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3735 4a8a32a2-be11-0410-ad9d-d568d2c75423