[clang] [clang][rtsan] Introduce realtime sanitizer codegen and driver (PR #102622)

[Fangrui Song via cfe-commits]

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+// RUN: %clang     -target x86_64-unknown-linux -fsanitize=realtime %s -S -emit-llvm -o - | FileCheck %s
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MaskRay wrote:

Thx for letting me know the existing asan.c/tsan. I'll try to clean up the two tests.

For this driver test which will use `-###`, `-O` is entirely uninteresting.

Sometimes `-O1` or above may be interesting for CodeGen tests but probably not for this.

https://github.com/llvm/llvm-project/pull/102622