[code-reflection] RFR: BytecodeGenerator cleanup and and types handling fixes

[Paul Sandoz]

On Fri, 19 Apr 2024 08:28:35 GMT, Adam Sotona <asotona at openjdk.org> wrote:

> I've narrowed implementation of `BytecodeGenerator` with:
> - clear stack handling 
> - better code optimization.
> - fixed handling of types
> - improved test coverage and test failure reporting

Marked as reviewed by psandoz (Lead).

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PR Review: https://git.openjdk.org/babylon/pull/58#pullrequestreview-2012590388