Changes From Review Feedback:

* Have the SimplifyLibCalls pass acquire the TargetData and pass it down to
  the optimization classes so they can use it to make better choices for
  the signatures of functions, etc.
* Rearrange the code a little so the utility functions are closer to their
  usage and keep the core of the pass near the top of the files.
* Adjust the StrLen pass to get/use the correct prototype depending on the
  TargetData::getIntPtrType() result. The result of strlen is size_t which
  could be either uint or ulong depending on the platform.
* Clean up some coding nits (cast vs. dyn_cast, remove redundant items from
  a switch, etc.)
* Implement the MemMoveOptimization as a twin of MemCpyOptimization (they
  only differ in name).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21569 91177308-0d34-0410-b5e6-96231b3b80d8

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