* c-common.c: Use ISGRAPH, ISLOWER, toupper.
        * c-lex.c, cccp.c, cexp.c, cexp.y, cppexp.c, dwarf2out.c, genattr.c,
        genattrtab.c, genemit.c, genextract.c, genpeep.c, tree.c: Likewise.
        * system.h (IN_CTYPE_DOMAIN): Define to 1 if HOST_EBCDIC.
        * defaults.h (TARGET_ESC): Add default.

From-SVN: r29192