[webgpu] Update EQUAL,GREATER,GREATER_EQUAL,LESS,LESS_EQUAL

[hujiajie]

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[gyagp]

Can we reuse the code here as the only diff among them is comparison symbol?

[hujiajie]

I don't feel it's worth another level of nesting.

[gyagp]

LGTM

[xhcao]

Jiajie, I also agree with Yang's comments to reuse the similar code, I like the code as below,
const ZERO = (sign(a) * 0 + 0);
const ONE = (sign(b) * 0 + 1);
const EQUAL = let resultTemp = select(${ZERO}, ${ONE}, a == b);;
const GREATER = let resultTemp = select(${ZERO}, ${ONE}, a > b);;
...

But I am OK if you want to keep your code style.

[hujiajie]

Jiajie, I also agree with Yang's comments to reuse the similar code, I like the code as below,
const ZERO = (sign(a) * 0 + 0);
const ONE = (sign(b) * 0 + 1);
const EQUAL = let resultTemp = select(${ZERO}, ${ONE}, a == b);;
const GREATER = let resultTemp = select(${ZERO}, ${ONE}, a > b);;
...

But I am OK if you want to keep your code style.

I have mixed feeling atm, but let me know if anyone has a strong preference. I may consider making that a separate PR afterwards.