[AMDGPU] Support horizontal vectorization of min/max.

Author: FarhanaAleen

Reviewed By: rampitec

Subscribers: AMDGPU

Differential Revision: https://reviews.llvm.org/D46604

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331920 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed