* src/SDCCsymt.c (initCSupport): change return type of divschar to

* src/SDCCsymt.c (initCSupport): change return type of divschar to
  int for PIC16
* src/pic16/genarith.c (genAddLit): sign-extend via standard routine
  (pic16_genMinusBits): simplified sign-extension
  (pic16_genUMult8XLit_8,pic16_genUMult8X8_8): renamed to
    pic16_genMult8XLit_n resp. pic16_genMult8X8_n, fixed and
    adjusted to correctly handle mixed-signed operands, disabled
    now unused multiplciation routines
* src/pic16/gen.c (pic16_pushpCodeOp): fixed to handle literals
  (assignResultValue): added argument denoting the size of the result
    as returned by the function (fixes upcasts in assigning from
    function calls: char foo(); int i = foo();)
  (genCall,genPcall,genGenPointerGet,genReceive): pass size of
    function result to assignResultValue
  (genMult): disabled inlined multiplication code
  (genDiv): augmented to also handle the modulus operator, fixed to
    handle mixed-signed operands correctly
  (genMod): simply call genDiv, disabled unused code
  (genAssign): fixed missing (sign-)extension on result
* src/pic16/main.c (_hasNativeMulFor): accept literals [-128..256) as
    valid char operands, allow signed operands for native code, added
    division and modulo operator handling
* device/lib/pic16/libsdcc/char/divschar.c: divschar returns an int

As a consequence, onebyte.c (if split into two files) and muldiv.c
pass regression tests.

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4237 4a8a32a2-be11-0410-ad9d-d568d2c75423