* src/SDCCpeeph.h,

* src/SDCCpeeph.h,
* src/SDCCpeeph.c (pcDistance),
* src/port.h,
* src/mcs51/ralloc.h,
* src/mcs51/ralloc.c (mcs51_regWithIdx),
* src/mcs51/main.h,
* src/mcs51/main.c (instructionSize, asmLineNode, updateOpRW,
mcs51opcodeCompare, asmLineNodeFromLineNode, getInstructionSize,
mcs51operandCompare, getRegsRead, getRegsWritten): made instruction
size calculation port specific,	started basis for some register
optimizations
* src/mcs51/gen.c (genFunction, genEndFunction): added case to handle
missing push/pop of r0/r1. Optimized push/pops
* src/mcs51/ralloc.c (packregisters): fixed bug #727095
* device/lib/_modsint.c (_modsint),
* device/lib/_modslong.c (_modslong): fixed sign of result in non-asm
and stack version so regression tests pass

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3236 4a8a32a2-be11-0410-ad9d-d568d2c75423