[X86] Don't set vector FADD,FSUB,FMUL,FDIV,FNEG,FSQRT to Expand early. For...

[X86] Don't set vector FADD,FSUB,FMUL,FDIV,FNEG,FSQRT to Expand early. For every legal FP type we either set them to Legal or Custom anyway. So let them stay defaulted to Legal and only change when they need to be Custom.

llvm-svn: 266847