llvm-project

3920bc61 - [TargetLowering] Change the `softPromoteHalfType` default to `true` (#175149)

[TargetLowering] Change the `softPromoteHalfType` default to `true` (#175149) The default `f16` lowering has some issues that result in incorrect float behavior, so over time most targets have switched to use `softPromoteHalfType`. Swap to soft promotion by default and add overrides for SystemZ and AMDGPU, which are the two remaining backends that still depend on this behavior. All basic `f16` op tests now pass on all remaining experimental arches. Fixes: https://github.com/llvm/llvm-project/issues/97981 Fixes: https://github.com/llvm/llvm-project/issues/97975