Ming-Hung Tsai 7a1c6dc4bf [space-map-disk] improve performance of finding a free bitmap entry
* Simply test the raw bitmap entries against zero, to avoid
  time-consumed reference-count value extraction.

* Improve the way of iterating entries inside a bitmap:
  Extract 64-bit of bitmap entries at once, and use bitwise shift
  to iterate through the entries.
2020-02-29 17:39:17 +08:00
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