Tweaks to C++ status: add a link to Faisal's generic lambdas implementation,
and mark "clarifying memory allocation" as done, since it turns out that our
optimizations here (such as they are) already conform to the new rules.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181110 91177308-0d34-0410-b5e6-96231b3b80d8