The bug was introduced in #13558 .
When merging dense hll structures, `hllDenseCompress` writes to wrong
location and the result will be zero. The unit tests didn't cover this
case.
This PR
+ fixes the bug
+ adds `PFDEBUG SIMD (ON|OFF)` for unit tests
+ adds a new TCL test to cover the cases
Synchronized from https://github.com/valkey-io/valkey/pull/1293
---------
Signed-off-by: Xuyang Wang <xuyangwang@link.cuhk.edu.cn>
Co-authored-by: debing.sun <debing.sun@redis.com>