With this fix, when encountering an out-of-range uimm8 operand, the code
now triggers an appropriate error message, clearly indicating that the
immediate value must be an integer within the range of 0 to 255.
These instructions are added by following the `LoongArch Reference
Manual Volume 1: Basic Architecture Version 1.00`.
Differential Revision: https://reviews.llvm.org/D124826