llvm-project

4953ebf3 - [LoongArch] Support `preserve_none` calling convention (#178566)

[LoongArch] Support `preserve_none` calling convention (#178566) Add support for the `preserve_none` calling convention on LoongArch. Registers `R4-R20` and `R23-R31` are treated as caller-saved and may be used for argument passing, except for `R31`.