[clang] [clang] Add sections to C++ DR status page (PR #165749)

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

They were previously flaky (I have buildbot failure emails showing those two tests failing back to April or something). Enabling the internal shell seems to have made them fail a lot more often. I've reverted that patch for now given it caused a lot of other issues.

https://github.com/llvm/llvm-project/pull/165749