Upgrade V8 to 2.3.8

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+oom_dump extracts useful information from Google Chrome OOM  minidumps.
+
+To build one needs a google-breakpad checkout
+(http://code.google.com/p/google-breakpad/).
+
+First, one needs to build and install breakpad itself. For instructions
+check google-breakpad, but currently it's as easy as:
+
+  ./configure
+  make
+  sudo make install
+
+(the catch: breakpad installs .so into /usr/local/lib, so you might
+need some additional tweaking to make it discoverable, for example,
+put a soft link into /usr/lib directory).
+
+Next step is to build v8.  Note: you should build x64 version of v8,
+if you're on 64-bit platform, otherwise you would get link error when
+building oom_dump.
+
+The last step is to build oom_dump itself.  The following command should work:
+
+  cd <v8 working copy>/tools/oom_dump
+  scons BREAKPAD_DIR=<path to google-breakpad working copy>
+
+(Additionally you can control v8 working copy dir, but default---../..---
+should work just fine).
+
+If everything goes fine, oom_dump <path to minidump> should print
+some useful information about OOM crash.