[SubZero] Fix code generation for vector type

The patch fixes legalizeToReg issues in vector code generation.
The patch also generates JALR for pointer to function and corrects encoding of FP conditional move instruction.

R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/2468133002 .

Patch from Jaydeep Patil <jaydeep.patil@imgtec.com>.
8 files changed