* fold-const.c (make_range): Always initialize arg0 and arg1.
        (fold): Simlarly for alt0 and alt1.
        * function.c (fixup_var_refs_insns): Initialize insn_list.
        (instantiate_virtual_regs_1): Initialize offset.
        * optabs.c (expand_binop): Initialize carry_in, carry_out, op0_xhigh
        and op1_xhigh.
        * stmt.c (expand_end_case): Initialize minval and maxval.

From-SVN: r26632