Clean up the code a bit.  Use isInstructionTriviallyDead to be more aggressive and more correct than use_empty().  This fixes PR635 and SimplifyCFG/2005-10-02-InvokeSimplify.ll
Clean up the code a bit.  Use isInstructionTriviallyDead to be more aggressive
and more correct than use_empty().  This fixes PR635 and
SimplifyCFG/2005-10-02-InvokeSimplify.ll


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@23616 91177308-0d34-0410-b5e6-96231b3b80d8

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