Add a new instruction OP_LOADI32.

That loads 32 bit integer bypassing pool access.

src/codedump.c

@@ -115,7 +115,7 @@ codedump(mrb_state *mrb, const mrb_irep *irep)
     ptrdiff_t i;
     uint32_t a;
     uint16_t b;
-    uint8_t c;
+    uint16_t c;
 
     ai = mrb_gc_arena_save(mrb);
 
@@ -169,6 +169,10 @@ codedump(mrb_state *mrb, const mrb_irep *irep)
       printf("OP_LOADI16\tR%d\t%d\t", a, (int)(int16_t)b);
       print_lv_a(mrb, irep, a);
       break;
+    CASE(OP_LOADI32, BSS);
+      printf("OP_LOADI32\tR%d\t%d\t", a, (int)(b<<16)+c);
+      print_lv_a(mrb, irep, a);
+      break;
     CASE(OP_LOADI__1, B);
       printf("OP_LOADI__1\tR%d\t\t", a);
       print_lv_a(mrb, irep, a);

src/vm.c

@@ -1030,7 +1030,7 @@ mrb_vm_exec(mrb_state *mrb, const struct RProc *proc, const mrb_code *pc)
   struct mrb_jmpbuf c_jmp;
   uint32_t a;
   uint16_t b;
-  uint8_t c;
+  uint16_t c;
   mrb_sym mid;
   const struct mrb_irep_catch_handler *ch;
 
@@ -1138,6 +1138,11 @@ RETRY_TRY_BLOCK:
       NEXT;
     }
 
+    CASE(OP_LOADI32, BSS) {
+      SET_INT_VALUE(mrb, regs[a], (mrb_int)(b<<16)+c);
+      NEXT;
+    }
+
     CASE(OP_LOADSYM, BB) {
       SET_SYM_VALUE(regs[a], syms[b]);
       NEXT;