Compilation pipeline
--------------------

### `compile`
`parse` → `optimize`

Parse produced IR without offsets and optimize produces flattened IR. For
more details about Gir's IR, see `ir.md`. For more details about `compile()`
see `api.md`

### `optimize`
`joinAdjacentOps` → `transformClearLoops` → `addOffsetProperties` →
`transformMultiplyLoops` → `flattenLoops`

For more details about optimization, see `optimizations.md`

Interpreter
-----------
For more details about `newVM()` and `runVM()` see `api.md`

### `newVM`
Created a new VM state object that can be passed to `runVM()`

### `runVM`
Takes a VM state object, executed it, and returns a new VM state object
describing the state after execution. The old state object is not modified