Don't repeat 'QueryInterface' calls for 'IReferenceTracker' when possible

[Sergio0694]

This PR optimizes the TrackerObject scenario in ComWrappers on NativeAOT. When we're in an aggregation scenario, we're doing a QI for IReferenceTracker as part of resolving the object identity. Then we immediately discard this reference. However, further down we do another QueryInterface for the same IID on the external object, before creating a native object wrapper.

This PR avoids that, and instead passes down the pointer retrieved when determining the identity, so we can reuse it.

CsWinRT passes this flag for all objects, and in XAML scenarios pretty much all WinRT objects are tracker objects. This change will avoid that repeated QI for all of them. This is part of an ongoing effort in CsWinRT to avoid as many QIs as we possibly can.

Note

I'd recommend reviewing with whitespace off.

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[Copilot]

Pull Request Overview

This PR refactors COM interop code to avoid duplicate QueryInterface calls for IReferenceTracker in aggregation scenarios.

• Updated NativeObjectWrapper.Create and related methods to pass a reusable reference tracker via a new ref parameter.
• Modified DetermineIdentityAndInner to output the reference tracker pointer for later reuse.
• Introduced NullableComHolder in TrackerObjectManager.NativeAot.cs to manage the lifetime of the reference tracker pointer.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
System/Runtime/InteropServices/ComWrappers.NativeAot.cs	Updated method signatures and logic to reuse an existing IReferenceTracker pointer and eliminate redundant QI calls.
System/Runtime/InteropServices/TrackerObjectManager.NativeAot.cs	Added NullableComHolder struct to support the new reference tracker management design.

Comments suppressed due to low confidence (1)

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/InteropServices/ComWrappers.NativeAot.cs:993

• The use of 'ref *&referenceTracker' is non-standard and likely erroneous. Please verify if 'ref referenceTracker' is intended.

retValue = RegisterObjectForComInstance(identity, inner, wrapperMaybe, flags, ref *&referenceTracker);

[jkotas]

LGTM

[IDisposable]

Nice