* src/SDCCopt.c (killDeadCode): change iCode type to DUMMY_READ_VOLATILE

* src/SDCCopt.c (killDeadCode): change iCode type to DUMMY_READ_VOLATILE
instead of deleting the iCode when an operand is volatile
* src/z80/gen.c (genDummyRead),
* src/mcs51/gen.c (genDummyRead),
* src/ds390/gen.c (genDummyRead),
* src/hc08/gen.c (genDummyRead): handle operands in IC_LEFT and/or IC_RIGHT,
not just IC_RIGHT
* src/SDCCicode.c (geniCodeCall): fixed bug #851607
* src/SDCC.y: fixed bug #850420

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3043 4a8a32a2-be11-0410-ad9d-d568d2c75423