Switch to i32 operations when heading to a wrap anyhow (#5022)

E.g. if we just do addition etc., then any higher bits will be wrapped out anyhow:

int32_t(int64_t(x) + int64_t(10))
=>
                x  + int32_t(10)

Found by the superoptimizer #4994 . This is by far the most promising suggestion it
had. Interestingly, it mainly helps Go, where it removes 20% of all Unary operations
(the extends and wraps), and Rust, where it removes 3%.

Helps #5004. This handles the common cases I see in the superoptimizer output, but
there are more that could be handled.

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