[clang] [C++20][Coroutines] Lambda-coroutine with operator new in promise_type (PR #84193)

[Erich Keane via cfe-commits]

erichkeane wrote:

> The clang-format check fails due to a change in `clang/docs/ReleaseNotes. rst`, which isn't mine. What's the protocol? Shall I fix the format issue, or can my change be merged anyway?

Nope, don't worry about that one.  That bot is being weird, feel free to merge without it.

https://github.com/llvm/llvm-project/pull/84193