Fix #3255: Ignore exceptions while decoding sequence point blobs.

ICSharpCode.ILSpyX/PdbProvider/PortableDebugInfoProvider.cs

@@ -98,6 +98,8 @@ namespace ICSharpCode.ILSpyX.PdbProvider
 			var debugInfo = metadata.GetMethodDebugInformation(method);
 			var sequencePoints = new List<Decompiler.DebugInfo.SequencePoint>();
 
+			try
+			{
 				foreach (var point in debugInfo.GetSequencePoints())
 				{
 					string documentFileName;
@@ -124,6 +126,11 @@ namespace ICSharpCode.ILSpyX.PdbProvider
 
 				return sequencePoints;
 			}
+			catch (BadImageFormatException)
+			{
+				return EmptyList<Decompiler.DebugInfo.SequencePoint>.Instance;
+			}
+		}
 
 		public IList<Variable> GetVariables(MethodDefinitionHandle method)
 		{