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Try-catch-block control flow fix/refactor (#2568)
<!--- Thank you for contributing to Boa! Please fill out the template below, and remove or add any information as you feel necessary. ---> This Pull Request is meant to address #1900. While working on it, there was a decent amount of refactoring/restructuring. Initially, I had kept with the current approach of just keeping track of a kind and counter on the environment stack, especially because that kept the size of each stack entry to a minimum. I did, however, make a switch to having the opcode create the `EnvStackEntry` with a start address and exit address for a bit more precision. It changes the following: - Consolidates `loop_env_stack` and `try_env_stack` into one `EnvStackEntry` struct. - Changes `Continue`, `Break`, `LoopStart`, `LoopContinue`, `FinallyStart`, `FinallyEnd` and various others. Most of this primarily revolves around the creating of `EnvStackEntry` and interacting with the `env_stack`. - Changes/updates the try-catch-finally, break and continue statement compilations as necessary - Adds an `AbruptCompletionRecord` in place of the `finally_jump` vector. - Adds some tests for try-catch-finally blocks with breaks.
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