Pack rb_iseq_constant_body from 296 to 288 bytes

[Fix GH-2099]

From: Lourens Naudé <lourens@bearmetal.eu>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67290 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_core.h

@@ -460,6 +460,8 @@ struct rb_iseq_constant_body {
     unsigned int ci_kw_size;
     unsigned int stack_max; /* for stack overflow check */
 
+    char catch_except_p; /* If a frame of this ISeq may catch exception, set TRUE */
+
 #if USE_MJIT
     /* The following fields are MJIT related info.  */
     VALUE (*jit_func)(struct rb_execution_context_struct *,
@@ -467,7 +469,6 @@ struct rb_iseq_constant_body {
     long unsigned total_calls; /* number of total calls with `mjit_exec()` */
     struct rb_mjit_unit *jit_unit;
 #endif
-    char catch_except_p; /* If a frame of this ISeq may catch exception, set TRUE */
 };
 
 /* T_IMEMO/iseq */