Optimized calling of C++ builtins (and HandleApiCall

Optimized calling of C++ builtins (and HandleApiCall
in particular).

  * Called function is passed on the stack instead of
    using a static variable.

  * Builtins that don't need the called function don't
    get it.

  * Made is_construct statically known to HandleApiCall
    by setting custom construct stub for API functions.

Committed: http://code.google.com/p/v8/source/detail?r=3613

[Mads Ager (chromium), 2010-01-15 08:19:31]

LGTM!