GenerateJavaAST no longer visits code in a block that
follows an if(true) block that itself contains a
throw, a return, or any other unconditional break
in control flow.  This prevents the compiler from
becoming confused when it wanders into parts of the
JDT AST that the JDT compile did not fill all the way in.

Review by: scottb


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5561 8db76d5a-ed1c-0410-87a9-c151d255dfc7