Convert FastNewClosureStub into hydrogen.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index b0045b8751b06258f0a241416e54615924ea910f..90871c2ba381fee5ee3d5e0438c55b24f914d8b5 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3861,6 +3861,15 @@ HObjectAccess HObjectAccess::ForJSObjectOffset(int offset,
 }
 
 
+HObjectAccess HObjectAccess::ForContextSlot(int index) {
+  ASSERT(index >= 0);
+  Portion portion = kInobject;
+  int offset = Context::kHeaderSize + index * kPointerSize;
+  ASSERT_EQ(offset, Context::SlotOffset(index) + kHeapObjectTag);
+  return HObjectAccess(portion, offset, Representation::Tagged());
+}
+
+
 HObjectAccess HObjectAccess::ForJSArrayOffset(int offset) {
   ASSERT(offset >= 0);
   Portion portion = kInobject;