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 84c5bebdb625038656580130461eb03a950229ec..71465bc38640ef9743ade57e70baf205d5304b59 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.
@@ -110,7 +108,6 @@ class FlowGraphCompiler : public FlowGraphVisitor {
   BlockEntryInstr* current_block_;
 
   CodeGenerator::DescriptorList* pc_descriptors_list_;
-  int stack_local_count_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };