atomicBucketWrapArray supports 32-bit os

[binbin0325]

Describe what this PR does / why we need it

On 32-bit os, pointers occupy 4 bytes, currently 8 bytes by default, resulting in some empty buckets

Does this pull request fix one issue?

Describe how you did it

Describe how to verify it

Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #429 (5c2dfb5) into master (671274f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #429   +/-   ##
=======================================
  Coverage   53.43%   53.43%           
=======================================
  Files          89       89           
  Lines        5820     5820           
=======================================
  Hits         3110     3110           
  Misses       2361     2361           
  Partials      349      349           

Impacted Files	Coverage Δ
core/stat/base/leap_array.go	72.88% <100.00%> (ø)

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[sczyh30]

LGTM

[sczyh30]

Thanks!