dfsan: Fix test with gcc 15. With gcc 15 we end up emitting a reference to the std::__glibcxx_assert_fail function because of this change: https://github.com/gcc-mirror/gcc/commit/361d230fd7800a7e749aba8ed020f54f5c26d504 combined with assertion checks in the std::atomic implementation. This reference is undefined with dfsan causing the test to fail. Fix it by defining the macro that disables assertions. Pull Request: https://github.com/llvm/llvm-project/pull/153873
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