[compiler-rt] [rtsan] Add test to ensure coroutines get caught (PR #111049)

[Florian Mayer via llvm-commits]

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+// RUN: %clangxx -std=c++20 -fsanitize=realtime %s -o %t
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fmayer wrote:

What is a system without C++20? This is a test of clang trunk, which supports C++20?

https://github.com/llvm/llvm-project/pull/111049