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75d5266fba
emit_seq() no longer emits directly but adds the sequence to a pending sequence, which we emit only when necessary (e.g. when we're about to emit a branch target, or when the parser is about to emit an opcode directly). This exposes more opportunities to the optimiser - in particular, the earlier commit which taught the optimiser how to change things like "SLW [n]:LLW [n]" to "DLW [n]" now gets a chance to kick in where one statement updates a variable and the following statement uses the updated value.