Move ReturnInstr to new scheme (x64 and ia32) and implement more code in new ia32 compiler.

runtime/vm/flow_graph_compiler_ia32.h

Index: runtime/vm/flow_graph_compiler_ia32.h
===================================================================
--- runtime/vm/flow_graph_compiler_ia32.h	(revision 8165)
+++ runtime/vm/flow_graph_compiler_ia32.h	(working copy)
@@ -45,7 +45,35 @@
   void FinalizeComments(const Code& code);
 
   Assembler* assembler() const { return assembler_; }
+  bool is_optimizing() const { return is_optimizing_; }
+  const ParsedFunction& parsed_function() const { return parsed_function_; }
 
+  void GenerateCallRuntime(intptr_t cid,
+                           intptr_t token_index,
+                           intptr_t try_index,
+                           const RuntimeEntry& entry);
+  void AddCurrentDescriptor(PcDescriptors::Kind kind,
+                            intptr_t cid,
+                            intptr_t token_index,
+                            intptr_t try_index);
+
+  void EmitInstanceCall(intptr_t cid,
+                        intptr_t token_index,
+                        intptr_t try_index,
+                        const String& function_name,
+                        intptr_t argument_count,
+                        const Array& argument_names,
+                        intptr_t checked_argument_count);
+  void EmitStaticCall(intptr_t token_index,
+                      intptr_t try_index,
+                      const Function& function,
+                      intptr_t argument_count,
+                      const Array& argument_names);
+  void GenerateCall(intptr_t token_index,
+                    intptr_t try_index,
+                    const ExternalLabel* label,
+                    PcDescriptors::Kind kind);
+
  private:
   friend class DeoptimizationStub;
 
@@ -67,14 +95,6 @@
     Label label;
   };
 
-  void GenerateCallRuntime(intptr_t cid,
-                           intptr_t token_index,
-                           intptr_t try_index,
-                           const RuntimeEntry& entry);
-  void AddCurrentDescriptor(PcDescriptors::Kind kind,
-                            intptr_t cid,
-                            intptr_t token_index,
-                            intptr_t try_index);
   void CopyParameters();
   void EmitInstructionPrologue(Instruction* instr);