Add support for mkrefany opcode.

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -593,7 +593,14 @@ namespace ICSharpCode.Decompiler.Ast
 							CountExpression = DivideBySize(arg1, type)
 						};
 					}
-					case ILCode.Mkrefany: return InlineAssembly(byteCode, args);
+				case ILCode.Mkrefany:
+					{
+						DirectionExpression dir = arg1 as DirectionExpression;
+						if (dir != null)
+							return new IdentifierExpression("__makeref").Invoke(dir.Expression.Detach());
+						else
+							return InlineAssembly(byteCode, args);
+					}
 					case ILCode.Newobj: {
 						Cecil.TypeReference declaringType = ((MethodReference)operand).DeclaringType;
 						if (declaringType is ArrayType) {

ICSharpCode.Decompiler/ILAst/TypeAnalysis.cs

@@ -453,6 +453,11 @@ namespace ICSharpCode.Decompiler.ILAst
 						}
 						return elementType;
 					}
+				case ILCode.Mkrefany:
+					if (forceInferChildren) {
+						InferTypeForExpression(expr.Arguments[0], (TypeReference)expr.Operand);
+					}
+					return typeSystem.TypedReference;
 					#endregion
 					#region Arithmetic instructions
 				case ILCode.Not: // bitwise complement