New steps would be
- `tools/dev/v8gen.py x64.release.sample`
- `ninja -C out.gn/x64.release.sample v8_monolith`
- `g++ -I. -Iinclude samples/hello-world.cc -o hello_world
     lv8_monolith -Lout.gn/x64.release.sample/obj/ -pthread -std=c++0x`
- `./hello_world` (no more worrying about .bin files)

R=jkummerow@chromium.org, mths@chromium.org

Change-Id: I3bba03b4c3ed34daf242a570f420b90f94ec6de0
Reviewed-on: https://chromium-review.googlesource.com/1179663
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55574}