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Feat/68020 efficiency - #68
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- Implemented support for long branches (`BRA.L`/`Bcc.L`) and improved branch size selection based on displacement.
- Updated handling of arbitrary strides in indexed addressing to use `mulu.l` for non-{1,2,4,8} strides on 68020, avoiding 16-bit truncation.
- Added alignment directives for `long` and `ptr` data labels, ensuring 4-byte alignment with `cnop 0,4` where necessary.
- Updated documentation to reflect changes in emitted code efficiency and alignment strategies.
- Added tests to validate new behaviors for branch sizing, data alignment, and stride handling across both 68000 and 68020 targets.
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