Don't send script source in afterCompile event

We've got complains that sending afterCompile events to debug message handler may have considerable impact on the profiler when inspected script does lots of 'eval's. The proposed solution is to request source of the compiled script lazily instead of sending it in afterCompile event.

Corresponding Chromium bug:
http://code.google.com/p/chromium/issues/detail?id=15913

Committed: http://code.google.com/p/v8/source/detail?r=2349

[Mads Ager (chromium), 2009-07-03 09:59:27]

LGTM!