[libcxx-commits] [clang] [libcxx] Elide suspension points via [[clang::coro_await_suspend_destroy]] (PR #152623)

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snarkmaster wrote:

@NewSigma, thanks! Two things:
 - I'm moving some code around, but the `await_suspend` path is 100% unchanged. I effectively just added a branch where a bunch of that stuff isn't needed.
 - I quickly ran my `folly::result` benchmark from the description under clang-17 rather than clang-19, and ... its performance is even worse on 17 than 19. So, I don't think that issue will help here.
 
 The fundamental problem I'm addressing isn't lack of devirtualization, but lack of heap alloc elision.

https://github.com/llvm/llvm-project/pull/152623