Allow static-dispatch style JS .call invocations to be inlined.

This is particularly relevant because super()/this() calls get translated as .call() ops, and this patch lets us inline them into the calling constructor.

http://gwt-code-reviews.appspot.com/201801/show
Review by: spoon


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7776 8db76d5a-ed1c-0410-87a9-c151d255dfc7