Tweaks to global object inline cache code

Tweaks to global object inline cache code.

Remove the check for deleted properties in the global load inline cache if the property is known to be read only.

Propegate the in loop flag for the global call inline cache.

Changed the propagation of the code flags in the call stub compiler to compute these the same way for all types of call stubs and assert that the flags for the generated code is the same as those used for the cache lookup.

Addressed a few comments from previous review in test-api.cc.

Committed: http://code.google.com/p/v8/source/detail?r=2308

[Kasper Lund, 2009-06-30 14:03:30]

LGTM.