fixed small, but annoying bugs in VB Lexer and profiler

src/AddIns/Analysis/Profiler/Controller/Data/PerformanceCounterDescriptor.cs

@@ -97,15 +97,19 @@ namespace ICSharpCode.Profiler.Controller.Data
 		/// </summary>
 		public static string GetProcessInstanceName(int pid)
 		{
-			PerformanceCounterCategory cat = new PerformanceCounterCategory("Process");
+			try {
+				PerformanceCounterCategory cat = new PerformanceCounterCategory("Process");
 
-			string[] instances = cat.GetInstanceNames();
-			foreach (string instance in instances) {
-				using (PerformanceCounter procIdCounter = new PerformanceCounter("Process", "ID Process", instance, true)) {
-					int val = (int)procIdCounter.RawValue;
-					if (val == pid)
-						return instance;
+				string[] instances = cat.GetInstanceNames();
+				foreach (string instance in instances) {
+					using (PerformanceCounter procIdCounter = new PerformanceCounter("Process", "ID Process", instance, true)) {
+						int val = (int)procIdCounter.RawValue;
+						if (val == pid)
+							return instance;
+					}
 				}
+			} catch (Exception) {
+				return null;
 			}
 			
 			return null;

src/Libraries/NRefactory/Project/Src/Lexer/VBNet/Lexer.cs

@@ -61,7 +61,7 @@ namespace ICSharpCode.NRefactory.Parser.VB
 					char ch = (char)nextChar;
 					#region XML mode
 					CheckXMLState(startLocation);
-					if (inXmlMode && xmlModeStack.Peek().level <= 0 && !xmlModeStack.Peek().isDocumentStart && !xmlModeStack.Peek().inXmlTag) {
+					if (inXmlMode && xmlModeStack.Count > 0 && xmlModeStack.Peek().level <= 0 && !xmlModeStack.Peek().isDocumentStart && !xmlModeStack.Peek().inXmlTag) {
 						XmlModeInfo info = xmlModeStack.Peek();
 						int peek = nextChar;
 						while (true) {
@@ -361,6 +361,7 @@ namespace ICSharpCode.NRefactory.Parser.VB
 			}
 		}
 
+		[Conditional("DEBUG")]
 		void CheckXMLState(Location startLocation)
 		{
 			if (inXmlMode && !xmlModeStack.Any())