Add missed declarations of prev_insn and first_insn in ccp_modify.
@@ -2429,7 +2429,7 @@ static int ccp_modify (MIR_context_t ctx) {
bb_insn_t bb_insn, next_bb_insn;
const_t val;
MIR_op_t op;
- MIR_insn_t insn;
+ MIR_insn_t insn, prev_insn, first_insn;
int res, change_p = FALSE;
#ifndef NDEBUG
