[LoongArch] Add testcases of LASX intrinsics with immediates

The testcases mainly cover three situations:
- the arguments which should be immediates are non immediates.
- the immediate is out of upper limit of the argument type.
- the immediate is out of lower limit of the argument type.

Depends on D155830

Reviewed By: SixWeining

Differential Revision: https://reviews.llvm.org/D157571