[llvm] [SystemZ] Handle f16 load positive/negative/complement without libcalls. (PR #136286)

[Trevor Gross via llvm-commits]

tgross35 wrote:

Was the ABI for f16 published anywhere public by the way? I'm trying to understand how `l*dfr` could work for both f32 and f16, I'm assuming they are passed in the same registers and aligned at the MSB.

https://github.com/llvm/llvm-project/pull/136286