fixed regression from fixing VRCPL and VRSQL
fixed regression from fixing VRCPL and VRSQL

Sign-extension is correct but only for single-precision reciprocal calculations.  Double-precision divides should still continue to mask in the zero-extended low 16 bits of the determined vector register slice if the previously executed divide instruction prepared a double-precision result rather than defining a single-precision one.

mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4