https://github.com/rnk commented:

The premerge tests failed on a modules crash recovery test case on other 
platforms, and those seem like true positives that need to be fixed.

Overall, I think the main risk with this approach is that it will break 
in-process, FP-based stack unwinders that validate that the target FP is within 
the thread's stack limits. Those seem like reasonable assumptions to me, since 
there's no good way to efficiently determine if an FP value is a legitimate 
stack address other than to compare against the bounds of the thread stack. 
That's what gives me caution and makes me want to let this be an Apple-only 
thing.

https://github.com/llvm/llvm-project/pull/133173
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