[llvm] [Sanitizers] Don't inline unpoisoning of small stacks when inlining disabled (PR #75555)

[Roy Sundahl via llvm-commits]

https://github.com/rsundahl approved this pull request.

This LGTM @wrotki . I see what @vitalybuka is saying but it might not be worth the added risk of the change at this time.

https://github.com/llvm/llvm-project/pull/75555