Check for mutability better (#127843)

This PR adds a function to determine if a type "looks" mutable. Since
it's impossible to be totally sure if something can or can't be modified
in C++, this makes a best-effort attempt to determine if variables of
that type can be modified or not.

The motivation for this change is the -Wunique-object-duplication
warning, which had a false positive due to a missed case while checking
for mutability. Pulling the logic into a separate function allows it to
be written much more cleanly. There should be no behavior change, except
that we no longer report function references to be mutable.
2 files changed
tree: df65cdf05acd2bfdeb4621ad1140288757dd2cd4
  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. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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