refactor: update duplicate methods in InsnArg classes

jadx-core/src/main/java/jadx/core/dex/instructions/args/FieldArg.java

@@ -59,6 +59,11 @@ public final class FieldArg extends RegisterArg {
 	}
 
 	@Override
+	public RegisterArg duplicate() {
+		return copyCommonParams(new FieldArg(field, instArg));
+	}
+
+	@Override
 	public boolean equals(Object obj) {
 		if (this == obj) {
 			return true;

jadx-core/src/main/java/jadx/core/dex/instructions/args/InsnArg.java

@@ -159,7 +159,7 @@ public abstract class InsnArg extends Typed {
 		return contains(AFlag.THIS);
 	}
 
-	protected InsnArg copyCommonParams(InsnArg copy) {
+	protected final <T extends InsnArg> T copyCommonParams(T copy) {
 		copy.copyAttributesFrom(this);
 		copy.setParentInsn(parentInsn);
 		return copy;

jadx-core/src/main/java/jadx/core/dex/instructions/args/LiteralArg.java

@@ -49,6 +49,13 @@ public final class LiteralArg extends InsnArg {
 	}
 
 	@Override
+	public InsnArg duplicate() {
+		LiteralArg copy = new LiteralArg(literal, getType());
+		copy.type = type;
+		return copyCommonParams(copy);
+	}
+
+	@Override
 	public int hashCode() {
 		return (int) (literal ^ literal >>> 32) + 31 * getType().hashCode();
 	}

jadx-core/src/main/java/jadx/core/dex/instructions/args/NamedArg.java

@@ -27,6 +27,16 @@ public final class NamedArg extends InsnArg implements Named {
 	}
 
 	@Override
+	public InsnArg duplicate() {
+		return copyCommonParams(new NamedArg(name, type));
+	}
+
+	@Override
+	public int hashCode() {
+		return name.hashCode();
+	}
+
+	@Override
 	public boolean equals(Object o) {
 		if (this == o) {
 			return true;
@@ -38,11 +48,6 @@ public final class NamedArg extends InsnArg implements Named {
 	}
 
 	@Override
-	public int hashCode() {
-		return name.hashCode();
-	}
-
-	@Override
 	public String toString() {
 		return '(' + name + ' ' + type + ')';
 	}

jadx-core/src/main/java/jadx/core/dex/instructions/args/RegisterArg.java

@@ -115,8 +115,7 @@ public class RegisterArg extends InsnArg implements Named {
 		if (sVar != null) {
 			dup.setSVar(sVar);
 		}
-		dup.copyAttributesFrom(this);
-		return dup;
+		return copyCommonParams(dup);
 	}
 
 	@Nullable