Use ULP based comparison.

[BruceDai]

int64_t GetBitwise(float value) {
    int64_t bitwiseValue = (value < T(0)) ? ~int64_t(0) : 0; // Extend sign.
    *std::launder(reinterpret_cast<T*>(&bitwiseValue)) = value;
    return bitwiseValue;
}

bool CompareUlp(float a, float b, uint64_t ulp) {
    return static_cast<uint64_t>(abs(GetBitwise(a) - GetBitwise(b))) > ulp;
}

@huningxin I implemented JavaScript compareUlp() function to align Chai's comment on #2, PTAL, thanks.

[BruceDai]

Thanks @huningxin .

I updated PR following your suggestion, now new getBitwise() function is only for float32 data

function getBitwise(value) {
  const buffer = new ArrayBuffer(4);
  const view = new DataView(buffer);
  view.setFloat32(0, value);
  return view.getInt32(0);
}

About bitwise of float32 data, I compared the return value of this JS function with one of native C++ GetBitwise() function, they are same.

@huningxin Please take a look again, thanks.

[BruceDai]

Thanks much @huningxin. I've updated commit to fix your review comments, PTAL, Thanks.

[BruceDai]

@huningxin I updated PR, PTAL, thanks.

[BruceDai]

I rebased this PR to only add JavaScript's ULP based comparison implementation.

@huningxin PTAL, thanks.