Fixed async/await decompilation when the GetAwaiter() is called on a value type.

ICSharpCode.Decompiler/ILAst/AsyncDecompiler.cs

@@ -576,6 +576,11 @@ namespace ICSharpCode.Decompiler.ILAst
 			if (!(getAwaiterCall.Match(ILCode.Call, out getAwaiterMethod, out awaitedExpr) || getAwaiterCall.Match(ILCode.Callvirt, out getAwaiterMethod, out awaitedExpr)))
 				return false;
 			
+			if (awaitedExpr.Code == ILCode.AddressOf) {
+				// remove 'AddressOf()' when calling GetAwaiter() on a value type
+				awaitedExpr = awaitedExpr.Arguments[0];
+			}
+			
 			// brtrue(IL_7C, call(valuetype [mscorlib]System.Runtime.CompilerServices.TaskAwaiter`1<bool>::get_IsCompleted, ldloca(CS$0$0001)))
 			ILLabel label;
 			ILExpression getIsCompletedCall;

ICSharpCode.Decompiler/Tests/Async.cs

@@ -76,6 +76,16 @@ public class Async
 		}
 	}
 	
+	public async void StreamCopyToWithConfigureAwait(Stream destination, int bufferSize)
+	{
+		byte[] array = new byte[bufferSize];
+		int count;
+		while ((count = await destination.ReadAsync(array, 0, array.Length).ConfigureAwait(false)) != 0)
+		{
+			await destination.WriteAsync(array, 0, count).ConfigureAwait(false);
+		}
+	}
+	
 	public async void AwaitInLoopCondition()
 	{
 		while (await this.SimpleBoolTaskMethod())