fix: numerical enum comparison

[yuta-game-music]

Currently, U# doesn't allow us to directly compare enum variable with number like:

EnumHoge fuga = EnumHoge.Fuga; var comp = fuga >= 3;

When EnumHoge.Fuga is 1, our expected result is comp=false, but the current implementation transcodes like: var comp = fuga != 3; which leads comp to be TRUE.

Note that this phenomenon doesn't occur when you write enum in the comparison code like: var comp = HogeEnum.Fuga >= 3; because HogeEnum.Fuga is transcoded to const 1, which makes the >= operation int>=int.

This change let you appropreately convert fuga >= 3 as it is.

[github-actions[bot]]

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[yuta-game-music]

I have read the CLA Document and I hereby sign the CLA

[yuta-game-music]

This will fix #68