Fixes to FileSystem code to use bitwise operations

[DonJayamanne]

For #8890

[codecov-io]

Codecov Report

Merging #8966 into master will increase coverage by 0.3%.
The diff coverage is 54.54%.

@@            Coverage Diff            @@
##           master    #8966     +/-   ##
=========================================
+ Coverage   57.87%   58.17%   +0.3%     
=========================================
  Files         529      529             
  Lines       27727    27729      +2     
  Branches     4172     4178      +6     
=========================================
+ Hits        16046    16132     +86     
+ Misses      10784    10699     -85     
- Partials      897      898      +1

Impacted Files	Coverage Δ
...interpreter/locators/services/KnownPathsService.ts	50.94% <0%> (ø)	⬆️
src/client/common/platform/fileSystem.ts	75% <60%> (+0.22%)	⬆️
src/client/common/process/proc.ts	15.55% <0%> (+0.74%)	⬆️
src/client/datascience/debugLocationTracker.ts	78.12% <0%> (+1.56%)	⬆️
src/client/linters/pydocstyle.ts	88.63% <0%> (+2.27%)	⬆️
src/client/language/characters.ts	37.14% <0%> (+2.85%)	⬆️
src/client/common/utils/version.ts	81.48% <0%> (+3.7%)	⬆️
src/client/providers/providerUtilities.ts	88.88% <0%> (+5.55%)	⬆️
src/client/common/utils/platform.ts	76.47% <0%> (+5.88%)	⬆️
src/client/datascience/cellFactory.ts	71.25% <0%> (+12.5%)	⬆️
... and 9 more

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