[mlir-tblgen] trim method body to empty with only spaces to avoid crash (#139568)

method body or default impl must be true empty. Even they contain only
spaces, ``mlir-tblgen`` considers they are non-empty and generates
invalid code lead to segment fault. It's very hard to debug.

```c++
    InterfaceMethod<
      ...
      /*methodBody=*/  [{ }],    // This must be true empty. Leaving a space here can lead to segment fault which is hard to figure out why
      /*defaultImpl=*/ [{
        ...
      }]
```

This PR trim spaces when method body or default implementation of
interface method is not empty. Now ``mlir-tblgen`` generates valid code
even when they contain only spaces.

---------

Co-authored-by: Fung Xie <ftse@nvidia.com>
Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
2 files changed
tree: 1a7a3d10f1a7f697b5d0ca7cdb7a416b1ce6732e
  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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