Repository: dotnet/runtime
File: src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs (C#)

Code before:
                {
                    MemberReference memberRef = ComponentReader.MetadataReader.GetMemberReference((MemberReferenceHandle)MethodHandle);
                    Name = ComponentReader.MetadataReader.GetString(memberRef.Name);
                    Signature = memberRef.DecodeMethodSignature<string, DisassemblingGenericContext>(typeProvider, genericContext);
                    owningTypeHandle = memberRef.Parent;
                }
                break;

                default:
                    throw new NotImplementedException();
            }

            if (owningType != null)
            {
                DeclaringType = owningType;
            }
            else
            {
                DeclaringType = MetadataNameFormatter.FormatHandle(ComponentReader.MetadataReader, owningTypeHandle);
            }

            StringBuilder sb = new StringBuilder();
            if (signaturePrefixes != null)
            {
                SignaturePrefixes = signaturePrefixes;
                foreach (var prefix in signaturePrefixes)
                {
                    sb.Append(prefix);
                    sb.Append(" ");
                }
            }
            sb.Append(Signature.ReturnType);
            sb.Append(" ");
            sb.Append(DeclaringType);
            sb.Append(".");
            sb.Append(Name);

            if (Signature.GenericParameterCount != 0)
            {
                sb.Append("<");
                for (int i = 0; i < Signature.GenericParameterCount; i++)
                {
                    if (i > 0)
                    {
                        sb.Append(", ");
                    }
                    if (instanceArgs != null && instanceArgs.Length > i)
                    {
                        sb.Append(instanceArgs[i]);
                    }
                    else

Review comment (suggestion):
`ReadyToRunMethod` defensively clones `instanceArgs` but stores the `signaturePrefixes` array directly, which makes `SignaturePrefixes` mutable from outside the type and can desynchronize it from `SignatureString` and `PgoInfoKey.SignatureString` if the caller later mutates the array. For consistency and to keep the signature-related data immutable, consider cloning `signaturePrefixes` before assigning it to the property (or exposing it as a read-only collection) just like `InstanceArgs`.
```suggestion
            if (signaturePrefixes is not null)
            {
                SignaturePrefixes = (string[])signaturePrefixes.Clone();
                foreach (var prefix in SignaturePrefixes)
```

Code after:
                {
                    MemberReference memberRef = ComponentReader.MetadataReader.GetMemberReference((MemberReferenceHandle)MethodHandle);
                    Name = ComponentReader.MetadataReader.GetString(memberRef.Name);
                    Signature = memberRef.DecodeMethodSignature<string, DisassemblingGenericContext>(typeProvider, genericContext);
                    owningTypeHandle = memberRef.Parent;
                }
                break;

                default:
                    throw new NotImplementedException();
            }

            if (owningType != null)
            {
                DeclaringType = owningType;
            }
            else
            {
                DeclaringType = MetadataNameFormatter.FormatHandle(ComponentReader.MetadataReader, owningTypeHandle);
            }

            StringBuilder sb = new StringBuilder();
            if (signaturePrefixes is not null)
            {
                SignaturePrefixes = (string[])signaturePrefixes.Clone();
                foreach (var prefix in SignaturePrefixes)
                {
                    sb.Append(prefix);
                    sb.Append(" ");
                }
            }
            sb.Append(Signature.ReturnType);
            sb.Append(" ");
            sb.Append(DeclaringType);
            sb.Append(".");
            sb.Append(Name);

            if (Signature.GenericParameterCount != 0)
            {
                sb.Append("<");
                for (int i = 0; i < Signature.GenericParameterCount; i++)
                {
                    if (i > 0)
                    {
                        sb.Append(", ");
                    }
                    if (instanceArgs != null && instanceArgs.Length > i)
                    {
                        sb.Append(instanceArgs[i]);
                    }
                    else