Add just enough state changes from EXTERNAL (outside V8) to OTHER...

Add just enough state changes from EXTERNAL (outside V8) to OTHER
(generic state inside V8) in the API to allow the V8 shell to run all
the mjsunit tests with heap protection on.

These state changes are only taken when built with
ENABLE_HEAP_PROTECTION.  The two states OTHER and EXTERNAL are treated
the same because we will not properly reenter OTHER through the API.

Committed: http://code.google.com/p/v8/source/detail?r=1643

[Kevin Millikin (Chromium), 2009-03-30 13:12:53]

If this seems OK, the next change will be to put ENTER_V8 everywhere in the API
and try it out in the browser.

[Mads Ager (chromium), 2009-03-30 13:26:06]

LGTM

I don't like having the macro all over the api implementation, but I don't see
how else to do this.

http://codereview.chromium.org/56060/diff/1/6
File src/global-handles.cc (right):

http://codereview.chromium.org/56060/diff/1/6#newcode157
Line 157: { // Leaving V8.
This probably does not lint?