Improve performance of converting contexts to AsmResolver types (#545)

The opportunities were discovered via performance profiling of Il2CppInterop.

Author: ds5678

Cpp2IL.Core/Utils/AsmResolver/ContextToMethodDescriptor.cs

@@ -43,7 +43,7 @@ public static IMethodDescriptor ToMethodDescriptor(this ConcreteGenericMethodAna
         }
         else
         {
-            var typeSignatures = methodGenericParameters.Select(p => p.ToTypeSignature(parentModule)).ToArray();
+            var typeSignatures = methodGenericParameters.Select(p => p.ToTypeSignature(parentModule));
             return parentModule.DefaultImporter.ImportMethod(memberReference.MakeGenericInstanceMethod(typeSignatures));
         }
     }

Cpp2IL.Core/Utils/AsmResolver/ContextToTypeSignature.cs

@@ -17,7 +17,7 @@ private static TypeDefinition GetTypeDefinition(this TypeAnalysisContext context
     public static TypeSignature ToTypeSignature(this TypeAnalysisContext context, ModuleDefinition parentModule) => context switch
     {
         ReferencedTypeAnalysisContext referencedTypeAnalysisContext => referencedTypeAnalysisContext.ToTypeSignature(parentModule),
-        _ => parentModule.DefaultImporter.ImportType(context.GetTypeDefinition()).ToTypeSignature(parentModule.RuntimeContext)
+        _ => parentModule.DefaultImporter.ImportType(context.GetTypeDefinition()).ToTypeSignature(context.IsValueType)
     };
 
     public static TypeSignature ToTypeSignature(this ReferencedTypeAnalysisContext context, ModuleDefinition parentModule) => context switch
@@ -32,7 +32,7 @@ private static TypeDefinition GetTypeDefinition(this TypeAnalysisContext context
     public static GenericInstanceTypeSignature ToTypeSignature(this GenericInstanceTypeAnalysisContext context, ModuleDefinition parentModule)
     {
         var genericType = context.GenericType.ToTypeSignature(parentModule).ToTypeDefOrRef();
-        var genericArguments = context.GenericArguments.Select(a => a.ToTypeSignature(parentModule)).ToArray();
+        var genericArguments = context.GenericArguments.Select(a => a.ToTypeSignature(parentModule));
 
         return new GenericInstanceTypeSignature(genericType, context.IsValueType, genericArguments);
     }