Trevor Gross 7a87cdbae5 Use a C-safe return type for __rust_[ui]128_* overflowing intrinsics
Most of our Rust-specific overflowing intrinsics currently return
`(i128, bool)`, which is not guaranteed to have a stable ABI. Switch to
returning the overflow via a mutable parameter and only directly
returning the integer result.

`__rust_i128_mulo` now matches the function signature of `__muloti4`,
but they do not share the same ABI on Windows so we cannot easily
deduplicate them.
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