[tree-ssa] Unused variable warnings

[law@redhat.com]

In message <20031019075227.GS15904@atrey.karlin.mff.cuni.cz>, Jan Hubicka write
 >> If there's really a path were index is uninitialized, then clearly we
 >> want to initialize it to a safe value, both for the branch and the
 >> mainline.
 >
 >Yes, however the path is created by inlining function max_issue and
 >optimizing out & and *.  So whether we realize this condition or not
 >depend on how much inlining we do that is somewhat ugly.
OK.


 >The path never actually happens in reality (max_issue either finds value
 >and sets it or indicate failure), but we are not smart enought to thread
 >the jumps.
OK.  These certain do happen :(

Let's get this fixed on the mainline.  No sense in diverging this code.

Jeff