[WebAssembly] Add `-i128:128` to the `datalayout` string. (#119204) Clang [defaults to aligning `__int128_t` to 16 bytes], while LLVM `datalayout` strings [default to aligning `i128` to 8 bytes]. Wasm is currently using the defaults for both, so it's inconsistent. Fix this by adding `-i128:128` to Wasm's `datalayout` string so that it aligns `i128` to 16 bytes too. This is similar to [llvm/llvm-project@dbad963](https://github.com/llvm/llvm-project/commit/dbad963a69fd7b16c6838f81b61167fbf00a413c) for SPARC. This fixes rust-lang/rust#133991; see that issue for further discussion. [defaults to aligning `__int128_t` to 16 bytes]: https://github.com/llvm/llvm-project/blob/f8b4182f076f8fe55f9d5f617b5a25008a77b22f/clang/lib/Basic/TargetInfo.cpp#L77 [default to aligning `i128` to 8 bytes]: https://llvm.org/docs/LangRef.html#langref-datalayout
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