[Feature Request][Refactor][compiler-v2] Stackless bytecode annotations should be cleared on transforms

[vineethk]

🚀 Feature Request

In the stackless bytecode pipeline, we now have various stages that could transform the code. When code is potentially modified, all associated annotations could be invalidated (because annotations map code offsets to some computed info, but code offsets could have changed), and so, conservatively, we should clear all the associated annotations.

We should do this consistently for all the transforms.