## Description 

This fixes a couple issues that cropped up when replaying more
transactions with tracing. In particular:
* We weren't properly tracking aliasing of references
* We were indexing in one place from the bottom of the stack instead off
of the top of the stack when looking for a stack value.
* We were recording the store of a value before the taking the snapshot
of the initial value.

## Test plan 

Ran it on a bunch of transactions to verify it.

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