Jakob Stoklund Olesen 08d55342e3 Don't use std::copy and std::copy_backward, run 10% faster.
Sometimes std::copy can become a memmove call, and that is not a good idea when
copying relatively few bytes as we are doing. We also get a small win by
changing two loops into one.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120265 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-28 22:17:14 +00:00
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