Calvin Rose 4782a76bca Add inital bytecode optimizations for #1163 ...

This removes unnecessary movn, movf, lds, and a few other instructions.
Any instructions that has not side effects and writes to a slot that
isn't used can be removed. A number of other optimizations can follow
from this:

- Implement the def-aliasing-var optimization better
- This function can be iterated as a fix point until no more
  instructions are removed.
- If we implement slot renaming, then we no longer need to free slots
  and can simplify the initial code generation a lot.

2023-05-29 16:10:48 -05:00

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