Make env_copy compaction safe

The original order of events is:

1. Allocate env_body.
2. Fill env_body using elements in src_env, and it performs operations
   that can trigger a GC.
3. Create the copied_env using vm_env_new.

However, if GC compaction runs during step 2, then copied_env would not
have yet been created and objects on env_body could move but it would
not be reference updated.

This commit changes the the order to be (1), (3), (2).

0 files changed, 0 insertions, 0 deletions