Revert "[mono] Fix a few corner case overflow operations"

[SamMonoRT]

Reverts #57407

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[SamMonoRT]

@lewing @lambdageek - can you approve this -- Vlad's original PR exposed a wasm issue

[ghost]

Hello @lambdageek!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

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[lewing]

What is the emscripten bug we are hitting?

[SamMonoRT]

What is the emscripten bug we are hitting?

Vlad has more details, and he was going to send email. He is on vacation this week, so possibly not going to happen until next week.

[BrzVlad]

Both in that PR and in parts of mono we rely on some undefined behavior when converting float to int. On wasm that undefined behavior resulted in some counter intuitive side effects, which turns out are allowed to happen. I will just refactor the code instead, so we don't run into undefined behavior at all in the first place.