Fix for bug 378393 checked in

Bug 378512 - NullPointerException, method not executed in small test case
https://bugs.eclipse.org/bugs/show_bug.cgi?id=378393

Removed caching of some visitors. The problem described in the bug was due
to using a visitor was not caching the state before using it. Fix checked
into trunk.

Cheers,

Pascal...

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