Reduce the size of `struct RBreak` to reduce memory usage.
The old size of `struct RBreak` was 56 bytes (`MRB_NO_BOXING`)
and it's bigger than other object structures. That increase the
size of `RVALUE` thus increase the total amount of memory consumption.
MODIFY
include/mruby/error.h
include/mruby/error.h
@@ -34,7 +34,6 @@ MRB_API mrb_value mrb_f_raise(mrb_state*, mrb_value);
struct RBreak {
MRB_OBJECT_HEADER;
- struct iv_tbl *iv;
struct RProc *proc;
mrb_value val;
};

MODIFY
src/vm.c
src/vm.c
@@ -810,7 +810,6 @@ break_new(mrb_state *mrb, struct RProc *p, mrb_value val)
struct RBreak *brk;
brk = (struct RBreak*)mrb_obj_alloc(mrb, MRB_TT_BREAK, NULL);
- brk->iv = NULL;
brk->proc = p;
brk->val = val;

Reduce the size of `struct RBreak` to reduce memory usage.

The old size of `struct RBreak` was 56 bytes (`MRB_NO_BOXING`)
and it's bigger than other object structures. That increase the
size of `RVALUE` thus increase the total amount of memory consumption.