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Add a hook in ClassReader to allow subclasses to get the bytecode offset of visited instructions.

Eric Bruneton requested to merge 317982-add-classreader-hook-to-get-bytecode-instruction-offsets into master

Closes #317982 (closed). I propose to add this hook to address #317982 (closed). Users can override ClassReader, store the last visited offset in a field, and read this field from each visitXxx method in MethodVisitor to get the bytecode offset of each instruction. I checked that this does not impact performance with the AdapterBenchmark.read_asmCurrent JMH benchmark.

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