Removed 2x Asserts (Blocks always reference source pools)

Author: clrjunkie

src/Microsoft.AspNet.Server.Kestrel/Infrastructure/MemoryPoolIterator2.cs

@@ -597,8 +597,7 @@ public void CopyFrom(ArraySegment<byte> buffer)
 
         public void CopyFrom(byte[] data, int offset, int count)
         {
-            Debug.Assert(_block != null);
-            Debug.Assert(_block.Pool != null);
+            Debug.Assert(_block != null);            
             Debug.Assert(_block.Next == null);
             Debug.Assert(_block.End == _index);
 
@@ -640,8 +639,7 @@ public void CopyFrom(byte[] data, int offset, int count)
 
         public unsafe void CopyFromAscii(string data)
         {
-            Debug.Assert(_block != null);
-            Debug.Assert(_block.Pool != null);
+            Debug.Assert(_block != null);            
             Debug.Assert(_block.Next == null);
             Debug.Assert(_block.End == _index);