* src/port.h: added mem.cabs_name to PORT

* src/port.h: added mem.cabs_name to PORT
* src/ds390/main.c,
* src/hc08/main.c,
* src/mcs51/main.c,
* src/pic16/main.c,
* src/pic/main.c,
* src/xa51/main.c,
* src/z80/main.c: added cabs_name initializers
* src/SDCCglue.c (emitStaticSeg): allocate and initialize absolute
  constants
  (emitMaps): emit absolutes in code memory into cabs_name
* src/SDCCmem.c,
* src/SDCCmem.h: added memory map c_abs and defined CABS_NAME
* src/ds390/gen.c (genCodePointerGet): fixed bug if left is a literal
* support/regression/fwk/include/testfwk.h: added define for at
* support/regression/tests/absolute.c: added, new

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4391 4a8a32a2-be11-0410-ad9d-d568d2c75423