[compiler-rt] [compiler-rt][rtsan] NFC: Introduce __rtsan_expect_not_realtime helper (PR #106314)

[Chris Apple via llvm-commits]

cjappl wrote:

Failure is in unrelated code:

```
_bk;t=1724809278452/var/lib/buildkite-agent/builds/linux-56-59b8f5d88-c4bpt-1/llvm-project/github-pull-requests/llvm/unittests/Analysis/UnrollAnalyzerTest.cpp:249: Failure

_bk;t=1724809278452Value of: I1 != SimplifiedValuesVector[5].end()

_bk;t=1724809278452  Actual: false

_bk;t=1724809278452Expected: true


```

https://github.com/llvm/llvm-project/pull/106314