Adding `GC.compact` and compacting GC support.

This commit adds the new method `GC.compact` and compacting GC support.
Please see this issue for caveats:

  https://bugs.ruby-lang.org/issues/15626

[Feature #15626]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/constant.h b/constant.h
index fcccf07384..6c8cda08db 100644
--- a/constant.h
+++ b/constant.h
@@ -31,8 +31,8 @@ typedef enum {
 typedef struct rb_const_entry_struct {
     rb_const_flag_t flag;
     int line;
-    const VALUE value;            /* should be mark */
-    const VALUE file;             /* should be mark */
+    VALUE value;            /* should be mark */
+    VALUE file;             /* should be mark */
 } rb_const_entry_t;
 
 VALUE rb_mod_private_constant(int argc, const VALUE *argv, VALUE obj);