[clang] [llvm] [LoongArch] add la v1.1 features for sys::getHostCPUFeatures (PR #115832)

[Lu Weining via cfe-commits]

https://github.com/SixWeining commented:

Could you add the`ual` feature in another PR? Thanks.

https://github.com/llvm/llvm-project/pull/115832