[LoongArch] Handle out-fo-range uimm8 operands in LoongArchAsmParser

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.

Author: wangleiat

llvm/lib/Target/LoongArch/AsmParser/LoongArchAsmParser.cpp

@@ -1335,6 +1335,9 @@ bool LoongArchAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
   case Match_InvalidUImm6:
     return generateImmOutOfRangeError(Operands, ErrorInfo, /*Lower=*/0,
                                       /*Upper=*/(1 << 6) - 1);
+  case Match_InvalidUImm8:
+    return generateImmOutOfRangeError(Operands, ErrorInfo, /*Lower=*/0,
+                                      /*Upper=*/(1 << 8) - 1);
   case Match_InvalidUImm12:
     return generateImmOutOfRangeError(Operands, ErrorInfo, /*Lower=*/0,
                                       /*Upper=*/(1 << 12) - 1);

llvm/test/MC/LoongArch/Basic/Privilege/invalid.s

@@ -12,3 +12,7 @@ iocsrrd.d $a0, $a1
 # ERR32: :[[#@LINE-1]]:1: error: instruction requires the following: LA64 Basic Integer and Privilege Instruction Set
 iocsrwr.d $a0, $a1
 # ERR32: :[[#@LINE-1]]:1: error: instruction requires the following: LA64 Basic Integer and Privilege Instruction Set
+
+## uimm8
+lddir $a0, $a0, 0x1ff
+# CHECK: :[[#@LINE-1]]:17: error: immediate must be an integer in the range [0, 255]