* as/mcs51/lkarea.c (lnkarea, lnkarea2): improved BSEG size calculation,

* as/mcs51/lkarea.c (lnkarea, lnkarea2): improved BSEG size calculation,
  (lnksect2): generate warnings for memory overlap
* src/SDCC.lex (doPragma, process_pragma): added pragma's codeseg and
  constseg to set the name of these segments so you can instruct the linker
  to place them in banks
* src/SDCCast.c (decorateType): use new macro IS_FUNCPTR()
* src/SDCCglobl.h: added MODEL_HUGE to enum,
  added code_seg and const_seg to options
* src/SDCCglue.c (emitMaps): use options.const_seg,
  (createInterruptVect): put interrupt vectors in segment HOME,
  (glue): put HOME before static segment and put the main glue in HOME,
  (glue): use options.code_seg
* src/SDCCicode.c (geniCodeCall): use new macro IS_FUNCPTR()
* src/SDCCmain.c: added option --codeseg and --constseg to set the name of
  these segments so you can instruct the linker to place them in banks
  (linkEdit): use code_loc for HOME segment which should be the first
  segment in code memory now
* src/SDCCmem.c: fixed more stuff like bug 1238386
* src/SDCCsymt.c (getSize): use generic pointer size for banked functions,
  (changePointer): don't change function pointers to code pointers for
  banked functions,
  (compareType): added exceptional check for banked function pointers
* src/SDCCsymt.h: changed IFFUNC_ISBANKEDCALL, added IS_FUNCPTR
* src/hc08/main.c (_hc08_genAssemblerPreamble): put HOME first, put CSEG
  after static in code memory
* src/mcs51/gen.c: added aopLiteralLong prototype,
  (aopForSym): use getSize for functions,
  (genCall): generate banked calls over one trampoline __sdcc_banked_call
  in HOME with lsb of address in r0, msb in r1 and bank in r2, use
  -Wl-bBANKSEG=0xbbaaaa option to set the address (aaaa) and bank (bb) of
  the segment,
  (genPcall): use call for literal function pointers and generate banked
  calls over the one trampoline so there's only one place for the user to
  modify according to his/hers hardware,
  (genEndFunction): jump to __sdcc_banked_ret in HOME for banked functions,
  (genPlusIncr): moved check icount>4 beyond inc dptr optimization
* src/mcs51/main.c: added keyword banked,
  (_mcs51_genExtraAreas): put HOME first followed by GSINIT, STATIC and CSEG
* support/Util/SDCCerr.c,
* support/Util/SDCCerr.h: added E_BANKED_WITH_CALLEESAVES, registers are
  needed for passing the bank and address to the trampoline
* device/lib/mcs51/crtbank.asm: added for bankswitching
* device/lib/mcs51/Makefile: added crtbank

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3804 4a8a32a2-be11-0410-ad9d-d568d2c75423