Fix issue with annotations in module-info.java files

[msridhar]

javac generates AssignmentTrees for assigning annotation attributes that, in the context of a module-info.java file, was causing a crash. Just skip analysis of such assignments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.10%. Comparing base (f17b330) to head (d922324).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1109   +/-   ##
=========================================
  Coverage     88.10%   88.10%           
- Complexity     2208     2209    +1     
=========================================
  Files            84       84           
  Lines          7177     7179    +2     
  Branches       1425     1426    +1     
=========================================
+ Hits           6323     6325    +2     
  Misses          430      430           
  Partials        424      424           

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