[ARM] Remove unused class member in ARMConstantIslandPass (#141093)

The map variable `BlockJumpTableRefCount` was added in commit
f5f28d5b0ce76af8f6944774aa73bad9e328b020 to track whether a basic block
was the target of any jump table entries. This was used in the function
`fixupBTI` to insert and remove BTIs after jump tables had been
modified.

Commit 3b742242a53ed0c2a2e1b6bb2352cace43c22030 removed `fixupBTI` on
the grounds that the work was now being done elsewhere. That left
`BlockJumpTableRefCount` still being created, but now nothing is using
it. So we can garbage-collect that variable and all the code that
populates it.
1 file changed
tree: d0387f458aa5a1450ad479c4d1abf7d4e36cf1df
  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-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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