[compiler-rt] [msan] Unwind stack before fatal reports (PR #77168)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> In some functions there is a parameter `*stack` and a variable `stack` in `{}` that shadows the parameter. I wonder whether the variable name for `FATAL` should be changed to reduce confusion...

That's kind of convention for all sanitizers, if we have macro, it create `stack` local object.
I am not rely concerned with shadowing, at it's only for fatal cases, but if you strong about that, I'd rather change parameters in allocator.

https://github.com/llvm/llvm-project/pull/77168