V8 Buildbot: Various build dir changes.
V8 Buildbot: Various build dir changes.

Continuation of https://codereview.chromium.org/439983003/

TBR=kjellander@chromium.org

Review URL: https://codereview.chromium.org/449633002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@287850 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build