[Modularize] Make `Location::operator bool` explicit

This unbreaks C++20 buildbot that was broken since
402baea0a9ff7894565449e41f700c4e6a3f99cb.

With implicit conversion in C++20 compilation mode the spaceship
will unintentionally be based on `operator bool`:

```cpp
auto foo(Location L, Location R) {
  return L <=> R;
  // Equivalent to the following line due to implicit conversions.
  // return L.operator bool() <=> R.operator bool();
}
```

The spaceship operator is rarely used explicitly, but its implicit uses
in the STL may cause surprising results, as exposed by the use of  `std::tie`
in 402baea0a9ff7894565449e41f700c4e6a3f99cb, which ended up changing the
comparisons results unintentionally.
1 file changed
tree: 4e7cc82e98f13f7d00693280f46679a94d1e2a16
  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. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-format-ignore
  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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Welcome to the LLVM project!

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