deps: upgrade to V8 4.8.271.17

Pick up V8 4.8 branch-head. This branch brings in @@isConcatSpreadable,
@@toPrimitive and ToLength ES6 changes. For full details see:
http://v8project.blogspot.de/2015/11/v8-release-48.html

v8/v8@fa163e2

Ref: nodejs#4399

deps/v8/.gitignore

@@ -20,6 +20,7 @@
 *.xcodeproj
 #*#
 *~
+.#*
 .cpplint-cache
 .cproject
 .d8_history
@@ -42,33 +43,20 @@ shell_g
 /build/gyp
 /build/ipch/
 /build/Release
+/build/win_toolchain.json
 /buildtools
 /hydrogen.cfg
 /obj
 /out
 /perf.data
 /perf.data.old
-/test/benchmarks/CHECKED_OUT_*
-/test/benchmarks/downloaded_*
-/test/benchmarks/kraken
-/test/benchmarks/octane
-/test/benchmarks/sunspider
-/test/mozilla/CHECKED_OUT_VERSION
+/test/benchmarks/data
 /test/mozilla/data
-/test/mozilla/data.old
-/test/mozilla/downloaded_*
 /test/promises-aplus/promises-tests
 /test/promises-aplus/promises-tests.tar.gz
 /test/promises-aplus/sinon
-/test/simdjs/CHECKED_OUT_*
-/test/simdjs/ecmascript_simd*
-/test/simdjs/data*
+/test/simdjs/data
 /test/test262/data
-/test/test262/data.old
-/test/test262/tc39-test262-*
-/test/test262-es6/data
-/test/test262-es6/data.old
-/test/test262-es6/tc39-test262-*
 /testing/gmock
 /testing/gtest
 /third_party
@@ -78,6 +66,9 @@ shell_g
 /tools/clang
 /tools/jsfunfuzz
 /tools/jsfunfuzz.zip
+/tools/luci-go/linux64/isolate
+/tools/luci-go/mac64/isolate
+/tools/luci-go/win64/isolate.exe
 /tools/oom_dump/oom_dump
 /tools/oom_dump/oom_dump.o
 /tools/swarming_client

deps/v8/AUTHORS

@@ -54,6 +54,7 @@ Erich Ocean <erich.ocean@me.com>
 Fedor Indutny <fedor@indutny.com>
 Felix Geisendörfer <haimuiba@gmail.com>
 Filipe David Manana <fdmanana@gmail.com>
+Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
 Geoffrey Garside <ggarside@gmail.com>
 Han Choongwoo <cwhan.tunz@gmail.com>
 Hirofumi Mako <mkhrfm@gmail.com>
@@ -81,6 +82,7 @@ Michael Lutz <michi@icosahedron.de>
 Michael Smith <mike@w3.org>
 Mike Gilbert <floppymaster@gmail.com>
 Mike Pennisi <mike@mikepennisi.com>
+Milton Chiang <milton.chiang@mediatek.com>
 Nicolas Antonius Ernst Leopold Maria Kaiser <nikai@nikai.net>
 Paolo Giarrusso <p.giarrusso@gmail.com>
 Patrick Gansterer <paroga@paroga.com>