Remove skip_static_calls_ as it uses an obsolete way to check for uncalled static calls. Will be re…

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
===================================================================
--- runtime/vm/flow_graph_compiler.cc	(revision 24431)
+++ runtime/vm/flow_graph_compiler.cc	(working copy)
@@ -617,8 +617,8 @@
       Array::ZoneHandle(ArgumentsDescriptor::New(argument_count,
                                                  argument_names));
   if (is_optimizing()) {
-    EmitStaticCall(function, arguments_descriptor, argument_count,
-                   deopt_id, token_pos, locs);
+    EmitOptimizedStaticCall(function, arguments_descriptor, argument_count,
+                            deopt_id, token_pos, locs);
   } else {
     EmitUnoptimizedStaticCall(function, arguments_descriptor, argument_count,
                               deopt_id, token_pos, locs);