Move quadratic behavior of Context's optimized function list verification behind --enable-slow-asse…

Move quadratic behavior of Context's optimized function list verification behind --enable-slow-asserts flag

BUG=webkit:90003
TEST=the following takes only about 1 second in debug mode: var a=[1,2,3,4,5]; eval("for (var i=0;i<50000;i++) a.sort(function(){return 1;});");

Committed: https://code.google.com/p/v8/source/detail?r=11982

[Jakob Kummerow, 2012-07-03 12:54:30]

PTAL.

I don't think we can create a regression test for this, as our test suite
specifies --enable-slow-asserts in debug mode. Also, even if it were possible,
given the nature of this CL I don't think there'd be much value in a regression
test.

[Michael Starzinger, 2012-07-03 13:00:47]

LGTM.

I also don't think that we need a regression test for that. Since it's neither a
functional nor a performance regression in release mode.