If an instruction simplifies, try again to simplify any uses of it.  This is
not very important since the pass is only used for testing, but it does make
it more realistic.  Suggested by Frits van Bommel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122336 91177308-0d34-0410-b5e6-96231b3b80d8
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