Elide unnecessary context reload in generated stubs.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index f4056c10d9115b8652b713f8a66c13ba526b6030..59b23d429c1e8f79c953d1d409bd1174793f16ef 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1342,10 +1342,11 @@ class LArithmeticT: public LTemplateInstruction<1, 3, 0> {
 };
 
 
-class LReturn: public LTemplateInstruction<0, 1, 0> {
+class LReturn: public LTemplateInstruction<0, 2, 0> {
  public:
-  explicit LReturn(LOperand* value) {
+  explicit LReturn(LOperand* value, LOperand* context) {
     inputs_[0] = value;
+    inputs_[1] = context;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(Return, "return")