[flang][Lower] Make reduction processing failure a hard error (#150233)

See #150178

This may regress some test cases which only ever passed by accident.

I've tested SPEC2017 and a sample of applications to check that this
doesn't break anything too obvious. Presumably this was not a widely
used feature or we would have noticed the bug sooner.

I'm unsure whether this should be backported to LLVM 21 or not: I think
it is much better to refuse to compile than to silently produce the
wrong result, but there is a chance this could regress something which
previously worked by accident. Opinions welcome.
4 files changed
tree: dc4f553e92719900832253b78570dc8549c2524e
  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. polly/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
README.md

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