Remove unused fields from iseq_inline_constant_cache_entry

Author: peterzhu2118

vm_core.h

@@ -261,10 +261,8 @@ union ic_serial_entry {
 struct iseq_inline_constant_cache_entry {
     VALUE flags;
 
-    VALUE value;              // v0
-    VALUE _unused1;           // v1
-    VALUE _unused2;           // v2
-    const rb_cref_t *ic_cref; // v3
+    VALUE value;
+    const rb_cref_t *ic_cref;
 };
 STATIC_ASSERT(sizeof_iseq_inline_constant_cache_entry,
               (offsetof(struct iseq_inline_constant_cache_entry, ic_cref) +