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

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 8130)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -1430,7 +1430,7 @@
 
   // Returns structure describing location constraints required
   // to emit native code for this instruction.
-  virtual LocationSummary* locs() const {
+  virtual LocationSummary* locs() {
     // TODO(vegorov): This should be pure virtual method.
     // However we are temporary using NULL for instructions that
     // were not converted to the location based code generation yet.
@@ -1650,7 +1650,7 @@
 
   virtual void RecordAssignedVars(BitVector* assigned_vars);
 
-  virtual LocationSummary* locs() const {
+  virtual LocationSummary* locs() {
     return computation()->locs();
   }
 
@@ -1701,7 +1701,7 @@
 
   virtual void RecordAssignedVars(BitVector* assigned_vars);
 
-  virtual LocationSummary* locs() const {
+  virtual LocationSummary* locs() {
     return computation()->locs();
   }
 
@@ -1719,7 +1719,7 @@
 class ReturnInstr : public Instruction {
  public:
   ReturnInstr(intptr_t token_index, Value* value)
-      : token_index_(token_index), value_(value) {
+      : token_index_(token_index), value_(value), locs_(NULL) {
     ASSERT(value_ != NULL);
   }
 
@@ -1731,9 +1731,13 @@
   virtual Instruction* StraightLineSuccessor() const { return NULL; }
   virtual void SetSuccessor(Instruction* instr) { UNREACHABLE(); }
 
+  virtual LocationSummary* locs();
+  virtual void EmitNativeCode(FlowGraphCompiler* compiler);
+
  private:
   const intptr_t token_index_;
   Value* value_;
+  LocationSummary* locs_;
 
   DISALLOW_COPY_AND_ASSIGN(ReturnInstr);
 };