[clr-interp] Fix INTOP_CGT_UN_I8 (#118511)

It was treating its inputs as 4 byte integers instead of 8 byte integers

Author: davidwrighton

src/coreclr/vm/interpexec.cpp

@@ -1604,7 +1604,7 @@ void InterpExecMethod(InterpreterFrame *pInterpreterFrame, InterpMethodContextFr
                     ip += 4;
                     break;
                 case INTOP_CGT_UN_I8:
-                    LOCAL_VAR(ip[1], int32_t) = LOCAL_VAR(ip[2], uint32_t) > LOCAL_VAR(ip[3], uint32_t);
+                    LOCAL_VAR(ip[1], int32_t) = LOCAL_VAR(ip[2], uint64_t) > LOCAL_VAR(ip[3], uint64_t);
                     ip += 4;
                     break;
                 case INTOP_CGT_UN_R4: