Post-Review Cleanup:

* Fix comments at top of file
* Change algorithm for running the call optimizations from n*n to something
  closer to n.
* Use a hash_map to store and lookup the optimizations since there will
  eventually (or potentially) be a large number of them. This gets lookup
  based on the name of the function to O(1). Each CallOptimizer now has a
  std::string member named func_name that tracks the name of the function
  that it applies to. It is this string that is entered into the hash_map
  for fast comparison against the function names encountered in the module.
* Cleanup some style issues pertaining to iterator invalidation
* Don't pass the Function pointer to the OptimizeCall function because if
  the optimization needs it, it can get it from the CallInst passed in.
* Add the skeleton for a new CallOptimizer, StrCatOptimizer which will
  eventually replace strcat's of constant strings with direct copies.

llvm-svn: 21526

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