[master] Update dependencies from dotnet/coreclr (dotnet/corefx#38505)

* Update dependencies from https://github.com/dotnet/coreclr build 20190612.2

- Microsoft.NET.Sdk.IL - 3.0.0-preview7.19312.2
- Microsoft.NETCore.ILAsm - 3.0.0-preview7.19312.2
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview7.19312.2

* Fix build errors

Commit migrated from https://github.com/dotnet/corefx/commit/5955ee2583d4509d37ecf55243e9e3c9af128487

diff --git a/src/libraries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentDictionary.cs b/src/libraries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentDictionary.cs
index 3729dc7..112b925 100644 (file)
--- a/src/libraries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentDictionary.cs
+++ b/src/libraries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentDictionary.cs
@@ -2082,7 +2082,7 @@ namespace System.Collections.Concurrent
         }
     }
 
-    internal sealed class IDictionaryDebugView<K, V>
+    internal sealed class IDictionaryDebugView<K, V> where K : notnull
     {
         private readonly IDictionary<K, V> _dictionary;