* Cleanups of instcombine    - Reenable gep (gep x) -> x    - Make instcombine do dead instruction elimination where it's really      easy.  Now visitors don't have to ensure they aren't not processing      dead instructions.
* Cleanups of instcombine
   - Reenable gep (gep x) -> x
   - Make instcombine do dead instruction elimination where it's really
     easy.  Now visitors don't have to ensure they aren't not processing
     dead instructions.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@3222 91177308-0d34-0410-b5e6-96231b3b80d8

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