* src/SDCCsymt.c (compareType): fixed bugs 1738367 and 1745717 with patch

* src/SDCCsymt.c (compareType): fixed bugs 1738367 and 1745717 with patch
  from Robert Larice, thanks
* support/regression/tests/bitopcse.c,
* support/regression/tests/bitvars.c,
* support/regression/tests/bug-908454.c: use <stdbool.h> for the bit types
* support/regression/tests/bug-927659.c: enabled test for z80
* support/regression/tests/bug1738367.c: added extra tests by Frieder
* support/regression/tests/bug1745717.c: new, added
* support/regression/tests/literalop.c,
* support/regression/tests/nullstring.c: removed storage definitions that
  are now in testfwk.h

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4879 4a8a32a2-be11-0410-ad9d-d568d2c75423