[llvm] [llvm][rtsan] Add transform pass for sanitize_realtime_unsafe (PR #109543)

[via llvm-commits]

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+; RUN: opt < %s -passes=rtsan -S | FileCheck %s
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davidtrevelyan wrote:

Awesome, great tool. Thanks for showing me this script - I've updated this test now

https://github.com/llvm/llvm-project/pull/109543