[X86] Canonicalize vXi64 SIGN_EXTEND_INREG vXi1 to use v2Xi32 splatted shifts instead

If somehow a vXi64 bool sign_extend_inreg pattern has been lowered to vector shifts (without PSRAQ support), then try to canonicalize to vXi32 shifts to improve likelihood of value tracking being able to fold them away.

Using a PSLLQ and bitcasted PSRAD node make it very difficult for later fold to recover from this.