Support allocating and calling closures in the new non-optimizing compiler.

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
diff --git a/runtime/vm/flow_graph_compiler_x64.h b/runtime/vm/flow_graph_compiler_x64.h
index 5c8463057c5bbb9e5b93a4183c32d02cad7d123b..9ef6310a521ac3dffc1ba5b95b0f5e80c17ac323 100644
--- a/runtime/vm/flow_graph_compiler_x64.h
+++ b/runtime/vm/flow_graph_compiler_x64.h
@@ -42,8 +42,6 @@ class FlowGraphCompiler : public FlowGraphVisitor {
     Label label;
   };
 
-  int stack_local_count() const { return stack_local_count_; }
-  void set_stack_local_count(int count) { stack_local_count_ = count; }
   BlockEntryInstr* current_block() const { return current_block_; }
 
   // Bail out of the flow graph compiler.  Does not return to the caller.
@@ -103,7 +101,6 @@ class FlowGraphCompiler : public FlowGraphVisitor {
   BlockEntryInstr* current_block_;
 
   CodeGenerator::DescriptorList* pc_descriptors_list_;
-  int stack_local_count_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };