Pass the SourceInfo of the mainType instead of null to JReboundEntryPoint when the binding isn't immediately known.  Prevents an AssertionError when using the -manual flag.

Patch by: jlabanca
Review by: scottb



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@6154 8db76d5a-ed1c-0410-87a9-c151d255dfc7