[X86] Add initial support for ISD::CLMUL vXi32/vXi64 custom lowering (#176759) These will be quicker if they are "scalarized" to use PCLMULQDQ and then packed back together instead of the default expansion - 256-bit/512-bit support will follow shortly. vXi8/vXi16 look like they will be quicker without PCLMULQDQ, assuming we can avoid so many multiplies after #176356 has landed.
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