Add a JsVisitor to restructure block-like structures to ensure compatibility with limits on the number of statements in a block in IE7.
Resolves issue 1440.

Patch by: bobv
Review by: scottb


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1916 8db76d5a-ed1c-0410-87a9-c151d255dfc7