AMDGPU/GlobalISel: Implement select() for G_BITCAST s32 <--> <2 x s16>

Reviewers: arsenm, nhaehnle

Subscribers: kzhuravl, wdng, yaxunl, rovka, kristof.beyls, dstuttard, tpr, t-tye, llvm-commits

Differential Revision: https://reviews.llvm.org/D45881

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332042 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed