Avoid XALNS7015 by skipping FixAbstractMethods rewrites on ReadyToRun assemblies (CoreCLR/.NET 11)

[Copilot]

CoreCLR is now the default on .NET 11 Android Release builds, and FixAbstractMethodsStep could attempt to rewrite R2R (mixed-mode) Java binding assemblies. That path throws System.NotSupportedException: Writing mixed-mode assemblies is not supported (XALNS7015) when Mono.Cecil writes the assembly.

• Change: guard FixAbstractMethodsStep for R2R inputs

  • In FixAbstractMethodsStep.ProcessAssembly, detect ReadyToRun assemblies and skip abstract-method patching for those assemblies.
  • R2R detection is based on PE metadata (CorHeader.ManagedNativeHeaderDirectory.Size > 0).
  • Emits a debug log (once per assembly name) when skipping.

• Change: re-enable previously suppressed coverage

  • Removed the temporary Assert.Ignore(...) for SimilarAndroidXAssemblyNames(..., AndroidRuntime.CoreCLR) so this scenario is exercised again instead of being silently skipped.

public void ProcessAssembly (AssemblyDefinition assembly, StepContext context)
{
	if (context.IsMainAssembly || !context.IsAndroidUserAssembly)
		return;

	if (IsReadyToRunAssembly (assembly))
		return;

	context.IsAssemblyModified |= FixAbstractMethods (assembly);
}