Fix reanalyze build after Tarrow representation change

[cknitt]

Update dead_optional_args.ml to use the current three-field Tarrow constructor.

The stale four-field patterns caused clean compiler builds to fail while compiling analysis/reanalyze.

[cristianoc]

Rebase on merge broke it

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.84%. Comparing base (5df516f) to head (c4c161d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8548      +/-   ##
==========================================
- Coverage   74.84%   74.84%   -0.01%     
==========================================
  Files         477      477              
  Lines       63360    63331      -29     
==========================================
- Hits        47421    47398      -23     
+ Misses      15939    15933       -6     

Files with missing lines	Coverage Δ
analysis/reanalyze/src/dead_optional_args.ml	86.66% <100.00%> (ø)

... and 2 files with indirect coverage changes

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commit: c4c161d