[RISCV] Move VMV0 elimination past machine SSA opts (#126850)

This is the follow up to #125026 that keeps mask operands in virtual
register form for as long as possible throughout the backend.

The diffs in this patch are from MachineCSE/MachineSink/RISCVVLOptimizer
kicking in.

The invariant that the mask COPY never has a subreg no longer holds
after MachineCSE (it coalesces some copies), so it needed to be relaxed.
36 files changed
tree: f610f41e71c22cd5942ab0c9f948dfedcdecc283
  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. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  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. pyproject.toml
  38. README.md
  39. SECURITY.md
README.md

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