Optimize array-length and fast element loads....

Optimize array-length and fast element loads.

1. Separating out the instance-type check from the array-length operation.

2. I also changed the bounds-check on keyed loads to use the length property
for JS arrays (like we do for array stores).

The new pattern should use less registers and allow more checks to be eliminated.


Committed: http://code.google.com/p/v8/source/detail?r=6125

[fschneider, 2010-12-30 19:29:48]

Added ARM files and addressed off-line comments.

[Vitaly Repeshko, 2010-12-31 11:53:46]

Still LGTM!