[GlobalISel] Fix store merging incorrectly classifying an unknown index expr as 0. (#90375)

During analysis, we incorrectly leave the offset part of an address info
struct
as zero, when in actual fact we failed to decompose it into base +
offset.
This results in incorrectly assuming that the address is adjacent to
another store
addr. To fix this we wrap the offset in an optional<> so we can
distinguish between
real zero and unknown.

Fixes issue #90242

(cherry picked from commit 19f4d68252b70c81ebb1686a5a31069eda5373de)
4 files changed
tree: 4fdcf55b17a1ef4da7c91ffac1b51dc8d7f1a9c1
  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. openmp/
  21. polly/
  22. pstl/
  23. runtimes/
  24. third-party/
  25. utils/
  26. .arcconfig
  27. .arclint
  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. README.md
  38. SECURITY.md
README.md

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