btcutil: reuse serialized tx during TxHash #2081
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btcutil.Block caches the serialized raw bytes of the block during ibd. This serialized block bytes includes the serialized tx. The current tx hash generation will re-serialized the de-serialized tx to create the raw bytes and it'll only then hash that. This commit changes the code so that the re-serialization never happens, saving tons of cpu and memory overhead.
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This is #2023, but with some code style fixes and added benchmarks.