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sidh: updates multiplication and reduction mod p434
Updates multiplication method described in: https://github.com/microsoft/PQCrypto-SIDH/blob/v3.4/src/P434/AMD64/fp_x64_asm.S#L258
Updates reduction method described in: https://github.com/microsoft/PQCrypto-SIDH/blob/v3.4/src/P434/AMD64/fp_x64_asm.S#L721-L727