[llvm-exegesis] Fix LBR checks/test

This patch fixes the LBR check in the local lit config. The test would
segfault as the loop body would be basically empty, causing a divide by
zero error. More investigation is needed there so we do not actually hit
that assertion and report a cleaner error somewhere. Specifying an
actual opcode to benchmark fixes the problem. The test would also fail
as -mcpu was set to the default x86 CPU rather than the one currently
being run on, so it would always fail to find a perf counter. This patch
fixes that by simply removing the -mcpu flag.

Given these issues, I'm not sure these tests have ever run in the ~5
years they have been in tree. There were some issues reported in
\#132861, so I guess we'll see if there are further issues when the
testing becomes more broad.
2 files changed
tree: 82cfadefa49bab5519c551e8dc685475e93f8a23
  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
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