Update V8 to version 4.1.0.21

This is a cherry-pick of all commits up to and including the
4.1.0.21 cherry-pick in Chromium.

Original commit message:

Version 4.1.0.21 (cherry-pick)

Merged 206e9136bde0f2b5ae8cb77afbb1e7833e5bd412

Unlink pages from the space page list after evacuation.

BUG=430201
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/953813002

Cr-Commit-Position: refs/branch-heads/4.1@{#22}
Cr-Branched-From: 2e08d2a7aa9d65d269d8c57aba82eb38a8cb0a18-refs/heads/candidates@{#25353}

---

FPIIM-449

Change-Id: I8c23c7bbb70772b4858fe8a47b64fa97ee0d1f8c
diff --git a/src/code-factory.h b/src/code-factory.h
index 3add384..f26bf2a 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -33,7 +33,9 @@
  public:
   // Initial states for ICs.
   static Callable LoadIC(Isolate* isolate, ContextualMode mode);
+  static Callable LoadICInOptimizedCode(Isolate* isolate, ContextualMode mode);
   static Callable KeyedLoadIC(Isolate* isolate);
+  static Callable KeyedLoadICInOptimizedCode(Isolate* isolate);
   static Callable StoreIC(Isolate* isolate, StrictMode mode);
   static Callable KeyedStoreIC(Isolate* isolate, StrictMode mode);
 
@@ -53,9 +55,13 @@
   static Callable StringAdd(Isolate* isolate, StringAddFlags flags,
                             PretenureFlag pretenure_flag);
 
+  static Callable AllocateHeapNumber(Isolate* isolate);
+
   static Callable CallFunction(Isolate* isolate, int argc,
                                CallFunctionFlags flags);
 };
-}
-}
+
+}  // namespace internal
+}  // namespace v8
+
 #endif  // V8_CODE_FACTORY_H_