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/log-utils.cc b/src/log-utils.cc
index c94d07a..278cff1 100644
--- a/src/log-utils.cc
+++ b/src/log-utils.cc
@@ -6,6 +6,7 @@
 
 #include "src/log-utils.h"
 #include "src/string-stream.h"
+#include "src/version.h"
 
 namespace v8 {
 namespace internal {
@@ -49,6 +50,14 @@
     } else {
       OpenFile(log_file_name);
     }
+
+    if (output_handle_ != nullptr) {
+      Log::MessageBuilder msg(this);
+      msg.Append("v8-version,%d,%d,%d,%d,%d", Version::GetMajor(),
+                 Version::GetMinor(), Version::GetBuild(), Version::GetPatch(),
+                 Version::IsCandidate());
+      msg.WriteToLogFile();
+    }
   }
 }