Make it possible to compile d8 for the host toolset as well

Make it possible to compile d8 for the host toolset as well

2nd attempt. Use a different output path for the host d8.

BUG=v8:1775
R=machenbach@chromium.org
LOG=n

Committed: https://code.google.com/p/v8/source/detail?r=18621

[Michael Achenbach, 2014-01-15 15:34:06]

On 2014/01/15 15:14:38, jochen wrote:

lgtm

[jochen (gone - plz use gerrit), 2014-01-15 15:35:16]

Committed patchset #1 manually as r18621 (presubmit successful).

[jochen (gone - plz use gerrit), 2014-01-15 15:46:57]

A revert of this CL has been created in
https://codereview.chromium.org/139523003/ by jochen@chromium.org.

The reason for reverting is: still doesn't work on arm.