toplev.c (flag_exceptions): Default value is 2.

toplev.c (flag_exceptions): Default value is 2.

        * toplev.c (flag_exceptions): Default value is 2.
        (compile_file): If flag_exceptions still has the value 2, then
        set it to 0.

        * lex.c (lang_init): Enable flag_exceptions by default if no
        command line switch was specified.
Gross hacks to allow front-ends to override -fexceptions.

From-SVN: r16152