Harness updates

[nth10sd]

A bunch of harness updates.

• Update the basic_flag_sets function and add tests.
• In a future PR, I'd need to update the tested wasm flags.

Not ready for review yet. Just testing coverage for now.

Edit: coverage worked

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by 0.88%. The diff coverage is 88.46%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   31.84%   32.72%   +0.88%     
==========================================
  Files          29       30       +1     
  Lines        2999     2979      -20     
==========================================
+ Hits          955      975      +20     
+ Misses       2044     2004      -40

Impacted Files	Coverage Δ
src/funfuzz/js/compare_jit.py	15.6% <0%> (ø)	:arrow_up:
src/funfuzz/js/loop.py	18.7% <0%> (-8.17%)	:arrow_down:
tests/js/test_shell_flags.py	100% <100%> (ø)
src/funfuzz/js/shell_flags.py	21.16% <88.88%> (+9.9%)	:arrow_up:
src/funfuzz/util/subprocesses.py	26.64% <0%> (+1.49%)	:arrow_up:
src/funfuzz/js/inspect_shell.py	45.53% <0%> (+4.46%)	:arrow_up:

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[nth10sd]

Local git-foo fun. Have pushed the deletion of the harness-updates branch successfully.