First create a list of candidates, then transform. This simplifies the code in
that you have don't have to worry that you may be using an invalidated
iterator.
Previously, each time we created a memset/memcpy we would reevaluate the entire
loop potentially resulting in lots of redundant work for large basic blocks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252817 91177308-0d34-0410-b5e6-96231b3b80d8