Correct `is_operand_value` for Swizzle addressing modes

src/checker.cpp

@@ -14,6 +14,8 @@ bool is_operand_value(Operand o) {
 	case Addressing_MapIndex:
 	case Addressing_OptionalOk:
 	case Addressing_SoaVariable:
+	case Addressing_SwizzleValue:
+	case Addressing_SwizzleVariable:
 		return true;
 	}
 	return false;