[NativeAOT] IlcCompileInput ignores ILLink output when RunILLink=true

`ComputeIlcCompileInputs` in `Microsoft.NETCore.Native.targets` sets `IlcCompileInput` from `@(IntermediateAssembly)`. When `RunILLink=true` and ILLink runs before ILC, the main assembly in `$(IntermediateLinkDir)` may differ from `IntermediateAssembly` (e.g. due to pre-trimming assembly rewrites). ILC compiles the wrong assembly, causing runtime failures.

The default NativeAOT flow has `RunILLink=false` so this does not arise. Android sets `RunILLink=true` to run custom ILLink steps before ILC.

**Workaround:**

Override `IlcCompileInput` after `ComputeIlcCompileInputs`:
```xml

```

Related: dotnet/android#11183

*This content was created with assistance from AI.*