Pavel Verigo 9d89b05f11 [WebAssembly] Fix trunc in FastISel (#138479) ...

Previous logic did not handle the case where the result bit size was
between 32 and 64 bits inclusive. I updated the if-statements for more
precise handling.

An alternative solution would have been to abort FastISel in case the
result type is not legal for FastISel.

Resolves: #64222.

This PR began as an investigation into the root cause of
https://github.com/ziglang/zig/issues/20966.

Godbolt link showing incorrect codegen on 20.1.0:
https://godbolt.org/z/cEr4vY7d4.

2025-05-06 14:16:35 -07:00

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