Update json_parser.rs

Author: madhav-madhusoodanan

crates/intrinsic-test/src/arm/json_parser.rs

@@ -88,14 +88,13 @@ fn json_to_intrinsic(
         .enumerate()
         .map(|(i, arg)| {
             let (type_name, arg_name) = Argument::<ArmIntrinsicType>::type_and_name_from_c(&arg);
+            let metadata = intr.args_prep.as_mut();
+            let metadata = metadata.and_then(|a| a.remove(arg_name));
+            let arg_prep: Option<ArgPrep> = metadata.and_then(|a| a.try_into().ok());
+            let constraint: Option<Constraint> = arg_prep.and_then(|a| a.try_into().ok());
             let ty = ArmIntrinsicType::from_c(type_name)
                 .unwrap_or_else(|_| panic!("Failed to parse argument '{arg}'"));
 
-            let arg_prep = intr.args_prep.as_mut();
-            let arg_prep = arg_prep.and_then(|a| a.remove(arg_name));
-            let arg_prep: Option<ArgPrep> = arg_prep.and_then(|a| a.try_into().ok());
-            let constraint: Option<Constraint> = arg_prep.and_then(|a| a.try_into().ok());
-
             let mut arg =
                 Argument::<ArmIntrinsicType>::new(i, arg_name.to_string(), ty, constraint);