add self to credits

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216155 91177308-0d34-0410-b5e6-96231b3b80d8
Remove custom implementations of max/min in StringRef that was originally added to work an old gcc bug. I believe its been fixed by now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216156 91177308-0d34-0410-b5e6-96231b3b80d8