Do not emit coverage/callsite info for implicit closure functions.

runtime/vm/coverage.cc

Index: runtime/vm/coverage.cc
diff --git a/runtime/vm/coverage.cc b/runtime/vm/coverage.cc
index 7892e37fea4e5aa702c9fd6a7ef3b592018cd46b..207f83193d87905889101a29707544b0fe7c0451 100644
--- a/runtime/vm/coverage.cc
+++ b/runtime/vm/coverage.cc
@@ -185,10 +185,6 @@ void CodeCoverage::PrintClass(const Library& lib,
         continue;
       }
       CompileAndAdd(function, hits_or_sites, pos_to_line, as_call_sites);
-      if (function.HasImplicitClosureFunction()) {
-        function = function.ImplicitClosureFunction();
-        CompileAndAdd(function, hits_or_sites, pos_to_line, as_call_sites);
-      }
       i++;
     }
   }