[ConfigImpact] Consider list.size as cheap and add tests

Summary: Consider list.size as cheap and add a bunch of tests

Reviewed By: skcho

Differential Revision: D27677605

fbshipit-source-id: 1dfa86b5b

infer/src/cost/ConfigImpactAnalysis.ml

@@ -472,7 +472,8 @@ module TransferFunctions = struct
     let dispatch : (Tenv.t, unit, unit) ProcnameDispatcher.ProcName.dispatcher =
       let open ProcnameDispatcher.ProcName in
       make_dispatcher
-        [ +PatternMatch.Java.implements_math &::.*--> ()
+        [ +PatternMatch.Java.implements_collection &:: "size" <>--> ()
+        ; +PatternMatch.Java.implements_math &::.*--> ()
         ; +PatternMatch.Java.implements_number &::.*--> ()
         ; +PatternMatch.Java.implements_system &::+ is_cheap_system_method &--> () ]
     in