[AMDGPU] Implement f16 fcopysign and fcopysign(f32, f64)

Differential Revision: https://reviews.llvm.org/D28496


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291954 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed