[TrimmableTypeMap] Improve trimmable typemap framework roots

[simonrozsival]

Splits the trimming improvements out of #11346.

This keeps the product-side trimmable typemap improvements separate from the APK comparison test PR:

• pass per-assembly typemap entries to ILLink
• mark framework assembly peers so framework ACW roots can be trimmed correctly
• support DynamicCodeSupport=false with trimmable typemaps

[Copilot]

Pull request overview

This PR improves the trimmable typemap pipeline so framework-generated peers can be treated as trimmable by default, and updates the CoreCLR trimming/R8 integration to pass the correct typemap entry assemblies to ILLink. It also adds coverage for DynamicCodeSupport=false behavior in trimmable typemap builds.

Changes:

• Add framework-ACW trimming behavior and tests verifying conditional vs unconditional framework ACW entries.
• Pass per-assembly *.TypeMap.dll assemblies to ILLink via --typemap-entry-assembly and mark typemap inputs as trimmable.
• Treat DynamicCodeSupport=false as “dynamic code unavailable” for array typemap sentinel emission, with a new end-to-end build test.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/Microsoft.Android.Sdk.TrimmableTypeMap.Tests/Generator/TypeMapModelBuilderTests.cs	Adds unit tests validating conditional/unconditional behavior for framework ACW peers.
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/TrimmableTypeMapBuildTests.cs	Adds an integration test ensuring DynamicCodeSupport=false is honored and array-rank sentinels are emitted.
src/Xamarin.Android.Build.Tasks/Tasks/GenerateTrimmableTypeMap.cs	Adds configurable framework assembly name inputs and defaults used during typemap generation.
src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.targets	Updates default max array-rank behavior when dynamic code is disabled and wires framework assembly names into the task.
src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.CoreCLR.targets	Passes per-assembly typemap entry assemblies to ILLink, marks typemap DLLs trimmable, and generates proguard configuration post-link.
src/Microsoft.Android.Sdk.TrimmableTypeMap/TrimmableTypeMapGenerator.cs	Marks framework peers (post-scan) to support trimming of framework ACWs.
src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/JavaPeerInfo.cs	Updates framework peer documentation and allows IsFrameworkAssembly to be mutated post-scan.

Comments suppressed due to low confidence (1)

src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/JavaPeerInfo.cs:56

• IsFrameworkAssembly is now settable on a record type, but other fields (e.g., GenerateArrayEntries) are computed from it during scanning. Allowing IsFrameworkAssembly to change after creation can leave the record in an inconsistent state unless related fields are updated together; prefer keeping it init-only and setting it during scanning (or recomputing dependent fields when changing it).

	/// <summary>
	/// True when the type belongs to a framework assembly supplied by the Android SDK.
	/// Framework ACWs are generated by the SDK and can be trimmed like bindings unless
	/// another rule explicitly roots them.
	/// </summary>
	public bool IsFrameworkAssembly { get; set; }

	/// <summary>
	/// True when per-rank array typemap entries should be generated for this peer.
	/// </summary>
	public bool GenerateArrayEntries { get; set; } = true;

[simonrozsival]

@copilot address the review

[Copilot]

@copilot address the review

Addressed in 84c8fcb.

I removed the redundant MarkFrameworkAssemblyPeers() pass in TrimmableTypeMapGenerator (scanner already sets IsFrameworkAssembly), and updated the DynamicCodeSupport test to parse runtimeconfig.json and assert runtimeOptions.configProperties["System.Runtime.CompilerServices.RuntimeFeature.IsDynamicCodeSupported"] == false instead of using a formatting-dependent string match.