Reid Spencer 303c65cea6 Fix some bugs found by running on llvm-test:
* MemCpyOptimization can only be optimized if the 3rd and 4th arguments are
  constants and we weren't checking for that.
* The result of llvm.memcpy (and llvm.memmove) is void* not sbyte*, put in
  a cast.

llvm-svn: 21570
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