Remove redundant checks related to quantized type (#110604)

[APFloat::getSmallest](https://github.com/llvm/llvm-project/blob/915df1ae41652e2f595ce741dcd8f01878ef4e30/llvm/include/llvm/ADT/APFloat.h#L1060)
(and similarly `APFloat:getLargest`)
```
APFloat getSmallest(const fltSemantics &Sem, bool Negative = false); 
```
return the positive number when the default value for the second
argument is used.

With that being said, the check
[QuantTypes.cpp#L325](https://github.com/llvm/llvm-project/blob/96f37ae45310885e09195be09d9c05e1c1dff86b/mlir/lib/Dialect/Quant/IR/QuantTypes.cpp#L325)

```c++
 if (scale <= 0.0 || std::isinf(scale) || std::isnan(scale))
    return emitError() << "illegal scale: " << scale;
```  

is already covered by the check which follows
[QuantTypes.cpp#L327](https://github.com/llvm/llvm-project/blob/96f37ae45310885e09195be09d9c05e1c1dff86b/mlir/lib/Dialect/Quant/IR/QuantTypes.cpp#L327)

```c++
  if (scale < minScale || scale > maxScale)
    return emitError() << "scale out of expressed type range [" << minScale
                       << ", " << maxScale << "]";
```

given that range `[positive-smallest-finite-number,
positive-largest-finite-number]` does not include `inf` and `nan`s.

I propose to remove the redundant check. Any suggestion for improving
the error message is welcome.
2 files changed
tree: 2227eb255cbc1e718c348dec3553b50697d267d5
  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
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