codegen.c: need to check `no_peephole()` before constant folding.
@@ -1136,6 +1136,7 @@ gen_int(codegen_scope *s, uint16_t dst, mrb_int i)
static mrb_bool
gen_uniop(codegen_scope *s, mrb_sym sym, uint16_t dst)
{
+ if (no_peephole(s)) return FALSE;
struct mrb_insn_data data = mrb_last_insn(s);
mrb_int n;
