[NFC] Re-enable MSVC C4611 diagnostic (#182100)

From MSDN:

https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-4-c4611?view=msvc-170

I do not believe this diagnostic happens in our code base any longer.
This diagnostic was disabled in 5c73e1f85c5d37a5b037c70f3c112eec5646acb3
and the review for it (https://reviews.llvm.org/D8572) says there were
two instances of the diagnostic as of 2015. But because this is about
interaction between `setjmp` and C++ object destruction, I don't think
we need to disable this diagnostic across the entire monorepo; we can
silence it for the project using setjmp if it still exists.

I enabled the diagnostic locally and my build was warning-free but I'd
like to see how pre- (and post-)commit CI do with this one.
1 file changed
tree: 295d97a3ad0d783a9d976cd0249e7f72aa39f805
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
README.md

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