change host_state drop order for InstanceHandle

[yun-yeo]

Description

This PR is following #2806
We still met prev.start > max assertion error even after we pathed #2806.
#2086 seem fixed drop order problem on Module, but not solved it when we use Instance.

I found some other place which can cause drop order problem when we use Instance.
After we patch this, I couldn't see more prev.start > max assertion.

This instance handle will be stay in

wasmer/lib/vm/src/instance/mod.rs

Lines 100 to 101 in 7fbaf6f

	/// Hosts can store arbitrary per-instance information here.
	host_state: Box<dyn Any>,

of Instance.

Review

• Add a short description of the change to the CHANGELOG.md file

[syrusakbary]

I think this fix makes sense for me. @Amanieu could you review it as well?