3.x: enable javac parameter saving in class files

[akarnokd]

Related #6832

[codecov]

Codecov Report

Merging #6839 into 3.x will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                3.x   #6839      +/-   ##
===========================================
- Coverage     98.24%   98.2%   -0.05%     
- Complexity     6376    6378       +2     
===========================================
  Files           715     715              
  Lines         46532   46532              
  Branches       6388    6388              
===========================================
- Hits          45715   45695      -20     
- Misses          293     310      +17     
- Partials        524     527       +3

Impacted Files	Coverage Δ	Complexity Δ
...nternal/operators/observable/ObservableCreate.java	79.48% <0%> (-18.81%)	2% <0%> (ø)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	89.9% <0%> (-8.26%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.44% <0%> (-2.91%)	2% <0%> (ø)
...eactivex/rxjava3/processors/BehaviorProcessor.java	96.55% <0%> (-2.47%)	50% <0%> (ø)
...perators/single/SingleFlatMapIterableFlowable.java	95% <0%> (-1.67%)	2% <0%> (ø)
...ternal/operators/completable/CompletableMerge.java	95.94% <0%> (-1.36%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	94.89% <0%> (-0.73%)	2% <0%> (ø)
...ternal/operators/observable/ObservableGroupBy.java	95.08% <0%> (-0.55%)	2% <0%> (ø)
.../reactivex/rxjava3/processors/ReplayProcessor.java	97.38% <0%> (-0.41%)	52% <0%> (ø)
... and 11 more

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