Support i64.mul_wide_s and i64.mul_wide_u from Wide Arithmetic proposal#8652
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Support i64.mul_wide_s and i64.mul_wide_u from Wide Arithmetic proposal#8652stevenfontanella wants to merge 3 commits intomainfrom
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Part of #8544. Unit tests were written by Gemini and double-checked against python with this script.
TODO: Move the existing 128 add/sub logic from the interpreter into int128.h.