Move "unsigned char" -> "uint8_t".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183051 91177308-0d34-0410-b5e6-96231b3b80d8
Fix comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183052 91177308-0d34-0410-b5e6-96231b3b80d8
Convert more unsigned char -> uint8_t.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183053 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for adding the contents of a StringRef to the MD5 hash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183054 91177308-0d34-0410-b5e6-96231b3b80d8