AMDGPU: Conversions always produce canonical results

Not sure why this was checking for denormals for f16.
My interpretation of the IEEE standard is conversions
should produce a canonical result, and the ISA manual
says denormals are created when appropriate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339064 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed