Merge pull request #38695 from dibarbet/brace_completion_null

Export limited semantic model in liveshare scenario to avoid null ptrs

src/Tools/ExternalAccess/LiveShare/LocalForwarders/CSharpRemoteCompilationFactoryService.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System.Composition;
+using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.LiveShare
+{
+    [ExportLanguageServiceFactory(typeof(ICompilationFactoryService), StringConstants.CSharpLspLanguageName), Shared]
+    internal class CSharpRemoteCompilationFactoryService : ILanguageServiceFactory
+    {
+        public ILanguageService CreateLanguageService(HostLanguageServices languageServices)
+        {
+            return languageServices.GetOriginalLanguageService<ICompilationFactoryService>();
+        }
+    }
+}

src/Tools/ExternalAccess/LiveShare/LocalForwarders/VBRemoteCompilationFactoryService.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System.Composition;
+using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.LiveShare.LocalForwarders
+{
+    [ExportLanguageServiceFactory(typeof(ICompilationFactoryService), StringConstants.VBLspLanguageName), Shared]
+    internal class VBRemoteCompilationFactoryService : ILanguageServiceFactory
+    {
+        public ILanguageService CreateLanguageService(HostLanguageServices languageServices)
+        {
+            return languageServices.GetOriginalLanguageService<ICompilationFactoryService>();
+        }
+    }
+}