[NFC] Fix multi-character character constant warning (#112809)

This is one of the many PRs to fix errors with LLVM_ENABLE_WERROR=on.
Built by GCC 11.

Fix warning:

In file included from llvm-project/llvm/lib/BinaryFormat/Minidump.cpp:9:
llvm-project/llvm/include/llvm/BinaryFormat/Minidump.h:250:37: error:
multi-character character constant [-Werror=multichar]
  250 |   static const uint32_t LLDB_FLAG = 'LLDB';
1 file changed
tree: fa2a4355cd30cdf52490c7e16ff033aa8aed3e8f
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
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