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Add helper support for the Octeon GFM carryless multiply selectors. This models the normal and reflected multiplication paths, including the XOR-and-multiply forms that update the result/input state used by Octeon crypto code. Reflected selectors operate on the architectural GFM register bank using bit-reflected register transfers rather than a separate shadow state. Keep the 64-bit UIA2 reduction path used by SNOW3G F9 and share that shortcut between the normal and reflected XORMUL1 paths. Signed-off-by: James Hilliard <james.hilliard1@gmail.com> Message-ID: <20260608-mips-octeon-missing-insns-v2-v16-4-daef7a0d8b04@gmail.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>