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/ic/access-compiler.h b/src/ic/access-compiler.h
index 928b70b..fe4369a 100644
--- a/src/ic/access-compiler.h
+++ b/src/ic/access-compiler.h
@@ -40,7 +40,10 @@
         kind_(kind),
         cache_holder_(cache_holder),
         isolate_(isolate),
-        masm_(isolate, NULL, 256) {}
+        masm_(isolate, NULL, 256) {
+    // TODO(yangguo): remove this once we can serialize IC stubs.
+    masm_.enable_serializer();
+  }
 
   Code::Kind kind() const { return kind_; }
   CacheHolderFlag cache_holder() const { return cache_holder_; }
@@ -51,6 +54,14 @@
 
   Register receiver() const { return registers_[0]; }
   Register name() const { return registers_[1]; }
+  Register slot() const {
+    DCHECK(FLAG_vector_ics);
+    return VectorLoadICDescriptor::SlotRegister();
+  }
+  Register vector() const {
+    DCHECK(FLAG_vector_ics);
+    return VectorLoadICDescriptor::VectorRegister();
+  }
   Register scratch1() const { return registers_[2]; }
   Register scratch2() const { return registers_[3]; }
   Register scratch3() const { return registers_[4]; }