Fixed initilizers and fixed statements which I broke during the refactoring.

ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs

@@ -175,8 +175,16 @@ namespace ICSharpCode.Decompiler.ILAst
 			
 			if (abortBeforeStep == ILAstOptimizationStep.IntroduceFixedStatements) return;
 			foreach(ILBlock block in method.GetSelfAndChildrenRecursive<ILBlock>()) {
-				for (int i = 0; i < block.Body.Count; i++) {
+				for (int i = block.Body.Count - 1; i >= 0; i--) {
+					// TODO: Move before loops
+					if (i < block.Body.Count)
+						IntroduceFixedStatements(block.Body, i);
+				}
+			}
+			foreach(ILBlock block in method.GetSelfAndChildrenRecursive<ILBlock>()) {
+				for (int i = block.Body.Count - 1; i >= 0; i--) {
 					// TODO: Move before loops
+					if (i < block.Body.Count)
 						IntroduceFixedStatements(block.Body, i);
 				}
 			}

ICSharpCode.Decompiler/ILAst/InitializerPeepholeTransforms.cs

@@ -162,7 +162,7 @@ namespace ICSharpCode.Decompiler.ILAst
 					if (nextExpr.Match(ILCode.Callvirt, out addMethod, out args) &&
 					    addMethod.Name == "Add" &&
 					    addMethod.HasThis &&
-					    args.Count == 2 &&
+					    args.Count >= 2 &&
 					    args[0].Match(ILCode.Ldloc, out v2) &&
 					    v == v2)
 					{