[llvm] StackProtector: use isInTailCallPosition to verify tail call position (PR #68997)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

Please don't try to set deadlines on reviews; the amount of time people have to spend on reviews can be a bit unpredictable. A lack of review doesn't imply approval.

If someone who has been reviewing a patch doesn't respond, put a "ping" comment in the review, and if there's still no response try to contact directly via email.  And if there's still no response, note that on the PR, and ask other reviewers to approve.

(I can pick up reviewing here if there's no response in a week or so.)

https://github.com/llvm/llvm-project/pull/68997