Fix #1980: IndexOutOfRangeException when choose `IL with C#` with System.Runtime.CompilerServices.Unsafe.Copy/InitBlock

ICSharpCode.Decompiler/CSharp/OutputVisitor/InsertMissingTokensDecorator.cs

@@ -43,6 +43,8 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 				currentList.Add(node);
 				nodes.Push(currentList);
 				currentList = new List<AstNode>();
+			} else if (node is Comment comment) {
+				comment.SetStartLocation(locationProvider.Location);
 			}
 			base.StartNode(node);
 		}
@@ -62,6 +64,8 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 					node.AddChildWithExistingRole(child);
 				}
 				currentList = nodes.Pop();
+			} else if (node is Comment comment) {
+				comment.SetEndLocation(locationProvider.Location);
 			}
 			base.EndNode(node);
 		}

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/Comment.cs

@@ -102,7 +102,19 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 				return endLocation;
 			}
 		}
-		
+
+		internal void SetStartLocation(TextLocation value)
+		{
+			ThrowIfFrozen();
+			this.startLocation = value;
+		}
+
+		internal void SetEndLocation(TextLocation value)
+		{
+			ThrowIfFrozen();
+			this.endLocation = value;
+		}
+
 		public Comment (string content, CommentType type = CommentType.SingleLine)
 		{
 			this.CommentType = type;