Subzero, MIPS32: lowerSelect for i1, i8, i16, i32, f32, f64

Implements lowerSelect for basic integer and float datatypes.
Support for i64 will be added as separate patch.
Crucial for running crosstests.

R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/2337023003 .

Patch from Srdjan Obucina <Srdjan.Obucina@imgtec.com>.
6 files changed