Generate portable pdbs in coreclr

src/Microsoft.AspNetCore.Mvc.Razor/Internal/DefaultRoslynCompilationService.cs

@@ -27,9 +27,14 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
     /// </summary>
     public class DefaultRoslynCompilationService : ICompilationService
     {
-        private readonly DebugInformationFormat _pdbFormat = SymbolsUtility.SupportsFullPdbGeneration() ?
-            DebugInformationFormat.Pdb :
+        private readonly DebugInformationFormat _pdbFormat =
+#if NET451
+            SymbolsUtility.SupportsFullPdbGeneration() ?
+                DebugInformationFormat.Pdb :
+                DebugInformationFormat.PortablePdb;
+#else
             DebugInformationFormat.PortablePdb;
+#endif
         private readonly ApplicationPartManager _partManager;
         private readonly IFileProvider _fileProvider;
         private readonly Action<RoslynCompilationContext> _compilationCallback;

src/Microsoft.AspNetCore.Mvc.Razor/Internal/SymbolsUtility.cs

@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+#if NET451
 using System;
 using System.Runtime.InteropServices;
 
@@ -42,4 +43,5 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
             return false;
         }
     }
-}
+}
+#endif