Cache thread counters when updating OS Process with suspended state

[dbwiddis]

Fixes #2621

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.32%. Comparing base (276f4c4) to head (fb52b30).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2622      +/-   ##
==========================================
- Coverage   86.84%   86.32%   -0.53%     
==========================================
  Files          30       30              
  Lines        1338     1338              
  Branches      189      189              
==========================================
- Hits         1162     1155       -7     
+ Misses        103      102       -1     
- Partials       73       81       +8     

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