* src/SDCCval.c (cheapestVal, valueFromLit): use TYPE_* types

* src/SDCCval.c (cheapestVal, valueFromLit): use TYPE_* types
* src/SDCCval.c (constVal): changed default to signed; hex and octal constants are unsigned; added recognition of "u" flag for unsigned
* src/SDCCval.c (valMult): fixed signdness, added warning for overflow
* src/SDCCval.c (valDiv, valMod): fixed signdness
* src/SDCCicode.c (operandOperation): fixed critical typo; fixed signedness of modulo, left and right shift

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@2807 4a8a32a2-be11-0410-ad9d-d568d2c75423