[mlir][vector] vector.splat and vector.broadcast folding/canonicalizing parity  (#150284)

This PR ensures parity in folding/canonicalizing of vector.broadcast
(from a scalar) and vector.splat. This means that by using
vector.broadcast instead of vector.splat (which is currently
deprecated), there is no loss in optimizations performed. All tests
which were previously checking folding/canonicalizing of vector.splat
are now done for vector.broadcast. The vector.splat canonicalization
tests are now in a separate file, ready for removal when, in the future,
we remove vector.splat completely.

This PR also adds a canonicalizer to vector.splat to always convert it
to vector.broadcast. This is to reduce the 'traffic' through
vector.splat.

There is a chance that this PR will break downstream users who create/expect 
for vector.splat. Changing all such logic to work just vector.broadcast instead
should fix. 
6 files changed
tree: 8ea251bda5ab2853737785c9b6a13666a273af12
  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
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