util.dbuffer: Add efficient shortcuts for discard() in certain cases
If the buffer is already empty, nothing to do. If we're throwing away the
whole buffer, we can just empty it and avoid read_chunk() (which in turn
may collapse()). These shortcuts are much more efficient.
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90da4c9b34b52dc3c3cc2c8f9e633364f7caec16 Fix incorrect version number as tag
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90da4c9b34b52dc3c3cc2c8f9e633364f7caec16 Fix incorrect version number as tag
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90da4c9b34b52dc3c3cc2c8f9e633364f7caec16 Fix incorrect version number as tag (again)
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0000000000000000000000000000000000000000 -m
0000000000000000000000000000000000000000 Fix incorrect version number as tag
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