https://git.ruby-lang.org/ruby.git/commit/?id=a618d64086

From a618d6408653b7f2459acb5af6205c42ad3aad87 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Mon, 16 Sep 2019 16:09:46 -0700
Subject: Allocate `INSN *` out of a separate arena


diff --git a/compile.c b/compile.c
index 0d3492b..9ba55e5 100644
--- a/compile.c
+++ b/compile.c
@@ -889,7 +889,8 @@ compile_data_alloc(rb_iseq_t *iseq, size_t size) https://github.com/ruby/ruby/blob/trunk/compile.c#L889
 static INSN *
 compile_data_alloc_insn(rb_iseq_t *iseq)
 {
-    return (INSN *)compile_data_alloc(iseq, sizeof(INSN));
+    struct iseq_compile_data_storage ** arena = &ISEQ_COMPILE_DATA(iseq)->insn.storage_current;
+    return (INSN *)compile_data_alloc_with_arena(arena, sizeof(INSN));
 }
 
 static LABEL *
-- 
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