slightly simplify code and substantially improve comment. Instead of
authorChris Lattner <sabre@nondot.org>
Thu, 18 Nov 2010 08:07:09 +0000 (08:07 +0000)
committerChris Lattner <sabre@nondot.org>
Thu, 18 Nov 2010 08:07:09 +0000 (08:07 +0000)
commitd528be6636539567194981a8c0f8b90220bec0a5
treec5106345606efa7effecf6bb91afb3248b3c45c4
parent5a7aeaa01904b9b0adf256108f302f8961295754
slightly simplify code and substantially improve comment.  Instead of
saying "it would be bad", give an example of what is going on.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119695 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Transforms/Scalar/MemCpyOptimizer.cpp