Fix the previously ineffective assert checking the number of arguments passed to

Fix the previously ineffective assert checking the number of arguments passed to
a runtime entry in the VM.

R=asiva@google.com

Committed: https://code.google.com/p/dart/source/detail?r=26826

[siva, 2013-08-28 22:52:19]

LGTM

(as discussed offline we could move the assertion inside
the macro in another CL).

[regis, 2013-08-28 22:55:30]

On 2013/08/28 22:52:19, siva wrote:
> LGTM
> 
> (as discussed offline we could move the assertion inside
> the macro in another CL).

Thanks, Siva. I'll submit as is and move the asserts in a follow up cl.

[regis, 2013-08-28 23:07:27]

Committed patchset #2 manually as r26826 (presubmit successful).