A collection of minor type-o fixes.  The first two aren't testable, but all tests pass with them.  I stumbled across them while experimenting with a std::move that checks its argument for non-const.  The third corrects a test that is currently failing.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@190563 91177308-0d34-0410-b5e6-96231b3b80d8