Commits on May 3, 2021

1. Bug fix & run overflow correction much more frequently in tests …

   * Fix overflow correction when `windowLog < cycleLog`. Previously, we
     got the correction wrong in this case, and our chain tables and binary
     trees would be corrupted. Now, we work as long as `maxDist` is a power
     of two, by adding `MAX(maxDist, cycleSize)` to our indices.
   * When `ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY` is defined to non-zero
     run overflow correction as frequently as allowed without impacting
     compression ratio.
   * Enable `ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY` in `fuzzer` and
     `zstreamtest` as well as all the OSS-Fuzz fuzzers. This has a 5-10%
     speed penalty at most, which seems reasonable.

   

   terrelln committed May 3, 2021
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