VM: In CompileAll, don't iterate collected closures for every class

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index 207e0afcc7f7eeaa0516e4fbaeafd85b41609329..124239341455cf53dedd91ca14c4ffd65e18903d 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -1390,24 +1390,6 @@ RawError* Compiler::CompileAllFunctions(const Class& cls) {
       func.ClearCode();
     }
   }
-
-  // Inner functions get added to the closures array. As part of compilation
-  // more closures can be added to the end of the array. Compile all the
-  // closures until we have reached the end of the "worklist".
-  const GrowableObjectArray& closures =
-      GrowableObjectArray::Handle(zone,
-          Isolate::Current()->object_store()->closure_functions());
-  for (int i = 0; i < closures.Length(); i++) {
-    func ^= closures.At(i);
-    if ((func.Owner() == cls.raw()) && !func.HasCode()) {
-      error = CompileFunction(thread, func);
-      if (!error.IsNull()) {
-        return error.raw();
-      }
-      func.ClearICDataArray();
-      func.ClearCode();
-    }
-  }
   return error.raw();
 }