docs: Update old VS 2008 references.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186968 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Remove use of asymmetric std::lower_bound comparator."

This reverts commit r185676.
Originally done because of VS 2008.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186969 91177308-0d34-0410-b5e6-96231b3b80d8