Add async serializer initialization for perf tests

src/Build/BackEnd/BuildManager/BuildManager.cs

@@ -20,6 +20,7 @@
 using Microsoft.Build.Internal;
 using Microsoft.Build.Logging;
 using Microsoft.Build.Shared;
+using Microsoft.Build.Tasks;
 using ForwardingLoggerRecord = Microsoft.Build.Logging.ForwardingLoggerRecord;
 using LoggerDescription = Microsoft.Build.Logging.LoggerDescription;
 
@@ -344,6 +345,8 @@ public static BuildManager DefaultBuildManager
         /// <exception cref="InvalidOperationException">Thrown if a build is already in progress.</exception>
         public void BeginBuild(BuildParameters parameters)
         {
+            System.Threading.Tasks.Task.Run(() => { ResolveAssemblyReference.InitializeSerializers(); });
+
             lock (_syncLock)
             {
                 // Check for build in progress.

src/Build/BackEnd/Components/Communications/NodeProviderOutOfProcBase.cs

@@ -17,9 +17,10 @@
 using Microsoft.Build.Internal;
 
 using BackendNativeMethods = Microsoft.Build.BackEnd.NativeMethods;
-using System.Threading.Tasks;
+using Task = System.Threading.Tasks.Task;
 using Microsoft.Build.Shared.FileSystem;
 using Microsoft.Build.Utilities;
+using DotNetFrameworkArchitecture = Microsoft.Build.Shared.DotNetFrameworkArchitecture;
 
 namespace Microsoft.Build.BackEnd
 {

src/Build/BackEnd/Components/RequestBuilder/RequestBuilder.cs

@@ -34,6 +34,7 @@
 using ReservedPropertyNames = Microsoft.Build.Internal.ReservedPropertyNames;
 using NodeLoggingContext = Microsoft.Build.BackEnd.Logging.NodeLoggingContext;
 using ProjectLoggingContext = Microsoft.Build.BackEnd.Logging.ProjectLoggingContext;
+using Task = System.Threading.Tasks.Task;
 
 namespace Microsoft.Build.BackEnd
 {

src/Build/BackEnd/Components/SdkResolution/MainNodeSdkResolverService.cs

@@ -13,6 +13,7 @@
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using Task = System.Threading.Tasks.Task;
 
 namespace Microsoft.Build.BackEnd.SdkResolution
 {

src/Build/Microsoft.Build.csproj

@@ -28,6 +28,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Framework\Microsoft.Build.Framework.csproj" />
+    <ProjectReference Include="..\Tasks\Microsoft.Build.Tasks.csproj" />
 
     <PackageReference Include="System.Collections.Immutable" />
     <PackageReference Include="System.IO.Compression" />