[Xamarin.Android.Build.Tasks] FixAbstractMethodsStep performance (#8650)

Context: #8421

Working a bit on build performance, I tested:

  * `dotnet new maui`

  * `dotnet build -bl`

The `.binlog` shows:

	LinkAssembliesNoShrink 3.797s

Attaching `dotnet-trace` as mentioned on:

https://github.com/xamarin/xamarin-android/blob/2f192386e8072f8e0ecaf0de2fe48654f3ade423/Documentation/guides/tracing.md#how-to-dotnet-trace-our-build

I see time broken down such as:

	FixAbstractMethods: 37%
	AssemblyDefinition.Write: 27%
	ProcessAssemblyDesigner: 20%
	CopyIfChanged: 13%
	DirectoryAssemblyResolver.GetAssembly: 4.4%

This made me focus in on `FixAbstractMethodsStep` and make the
following changes:

  * All calls for `TypeReference.Resolve()` and
    `MethodReference.Resolve()` should go through the
    `TypeDefinitionCache` to avoid repeated lookups.

  * `IsInOverrides()` can compare the `MethodReference.Name` before
    calling `Resolve()`.  It could resolve many unnecessary methods
    otherwise.

After these changes, I instead see from `dotnet-trace`:

	--1.45s (3.7%)    xamarin.android.build.tasks!MonoDroid.Tuner.FixAbstractMethodsStep.FixAbstractMethods()
	++949.70ms (2.5%) xamarin.android.build.tasks!MonoDroid.Tuner.FixAbstractMethodsStep.FixAbstractMethods()

Time is now broken down differently, such as:

	AssemblyDefinition.Write: 31%
	FixAbstractMethods: 28%
	ProcessAssemblyDesigner: 23%
	CopyIfChanged: 12%
	DirectoryAssemblyResolver.GetAssembly: 4.8%

In an overall `.binlog` (without `dotnet-trace` attached):

	--LinkAssembliesNoShrink 3.797s
	++LinkAssembliesNoShrink 3.105s

This saved ~700ms on initial build of a new MAUI project.

Author: jonathanpeppers

src/Xamarin.Android.Build.Tasks/Linker/MonoDroid.Tuner/FixAbstractMethodsStep.cs

@@ -141,7 +141,7 @@ bool MightNeedFix (TypeDefinition type)
 			return !type.IsAbstract && type.IsSubclassOf ("Java.Lang.Object", cache);
 		}
 
-		static bool CompareTypes (TypeReference iType, TypeReference tType)
+		bool CompareTypes (TypeReference iType, TypeReference tType)
 		{
 			if (iType.IsGenericParameter)
 				return true;
@@ -164,11 +164,11 @@ static bool CompareTypes (TypeReference iType, TypeReference tType)
 			if (iType.Namespace != tType.Namespace)
 				return false;
 
-			TypeDefinition iTypeDef = iType.Resolve ();
+			TypeDefinition iTypeDef = cache.Resolve (iType);
 			if (iTypeDef == null)
 				return false;
 
-			TypeDefinition tTypeDef = tType.Resolve ();
+			TypeDefinition tTypeDef = cache.Resolve (tType);
 			if (tTypeDef == null)
 				return false;
 
@@ -198,7 +198,7 @@ bool IsInOverrides (MethodDefinition iMethod, MethodDefinition tMethod)
 				return false;
 
 			foreach (var o in tMethod.Overrides)
-				if (o != null && iMethod == o.Resolve ())
+				if (o != null && iMethod.Name == o.Name && iMethod == cache.Resolve (o))
 					return true;
 
 			return false;
@@ -252,7 +252,7 @@ bool FixAbstractMethods (TypeDefinition type)
 
 			foreach (var ifaceInfo in type.Interfaces) {
 				var iface    = ifaceInfo.InterfaceType;
-				var ifaceDef = iface.Resolve ();
+				var ifaceDef = cache.Resolve (iface);
 				if (ifaceDef == null) {
 					LogMessage ($"Unable to unresolve interface: {iface.FullName}");
 					continue;