[llvm] RuntimeLibcalls: Add entries for stackprotector globals (PR #154930)

[Reid Kleckner via llvm-commits]

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

This seems like a net improvement, and I think the tests should be comprehensive enough to cover the risk of unintented functionality change. If you want to build confidence, you could pick a stack protector test, and fill in the matrix of affected architectures and operating systems to cover all gaps.

https://github.com/llvm/llvm-project/pull/154930