[GlobalISel][X86] Support float/double and vector types.

Summary: [GlobalISel][X86] Add support for f32/f64 and vector types in RegisterBank and InstructionSelector.

Reviewers: delena, zvi

Reviewed By: zvi

Subscribers: dberris, rovka, llvm-commits, kristof.beyls

Differential Revision: https://reviews.llvm.org/D30533

llvm-svn: 296856