Reduce the cost of argumentCount checks in the JS bindings
https://bugs.webkit.org/show_bug.cgi?id=138289

Reviewed by Sam Weinig.

Slightly reduce the cost of argumentCount checks in the JS bindings by
hinting to the compiler that it is UNLIKELY that those methods are
called with too few arguments.

I see a 3% progression on PerformanceTests/DOM/DOMDivWalk.html
performance test.

No new tests, no behavior change.

* bindings/scripts/CodeGeneratorJS.pm:
(GenerateArgumentsCountCheck):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175462 268f45cc-cd09-0410-ab3c-d52691b4dbfc