no memory copy for call_iseq

src/proc.c

@@ -9,6 +9,10 @@
 #include "mruby/class.h"
 #include "opcode.h"
 
+static mrb_code call_iseq[] = {
+  MKOP_A(OP_CALL, 0),
+};
+
 struct RProc *
 mrb_proc_new(mrb_state *mrb, mrb_irep *irep)
 {
@@ -144,14 +148,13 @@ void
 mrb_init_proc(mrb_state *mrb)
 {
   struct RProc *m;
-  mrb_code *call_iseq = (mrb_code *)mrb_alloca(mrb, sizeof(mrb_code));
   mrb_irep *call_irep = (mrb_irep *)mrb_alloca(mrb, sizeof(mrb_irep));
 
   if ( call_iseq == NULL || call_irep == NULL )
     return;
 
   memset(call_irep, 0, sizeof(mrb_irep));
-  *call_iseq = MKOP_A(OP_CALL, 0);
+  call_irep->flags = MRB_ISEQ_NO_FREE;
   call_irep->idx = -1;
   call_irep->iseq = call_iseq;
   call_irep->ilen = 1;