[WebAssembly] Split and tidy up target features test (#96735)

This splits `target-features.ll` into two tests:
`target-features-attrs.ll` and `target-features-cpus.ll`.

Now `target-features-attrs.ll` contains tests with bitcode function
attributes and `-mattr=` options. The current `target-features.ll`
file's FileCheck lines are confusing, mainly because it is unclear how
`CHECK` and `ATTRS` lines are meant to be different. Turns out, before
https://github.com/llvm/llvm-project/commit/67ec8744d7e72b50a5db5038c9643584ce57cb0c,
`-mattr=` options used to override any existing bitcode function
attributes, but after the commit that's not the case anymore. So the
original test had a line that tested `i32.atomic.rmw.cmpxchg` was not
generated when `-mattr=+simd128` was given (because the existing
`+atomics` in the function attributes is overriden). That commit deleted
that line and changed some `ATTRS` lines into `CHECK`, which was
confusing. This PR simplifies that part and does not test the absence of
any instructions, and the effect of `-mattr=` option is only tested with
the target features section.

And `target-features-cpus.ll` only tests the sets of features enabled by
`-mcpu=` lines. It is better to have this as a separate file because
once you have bitcode function attributes they end up in the target
features section too, making the testing of only the `-mcpu=` options
difficult.
2 files changed
tree: 096d4f170421a7a3b31ef6fbb5c0d8d8f4d869bb
  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. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

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