Roll Observatory packages and add a roll script

packages/analyzer/lib/src/generated/scanner.dart

Index: packages/analyzer/lib/src/generated/scanner.dart
diff --git a/analyzer/lib/src/generated/scanner.dart b/packages/analyzer/lib/src/generated/scanner.dart
similarity index 99%
rename from analyzer/lib/src/generated/scanner.dart
rename to packages/analyzer/lib/src/generated/scanner.dart
index 9e028ca29686c8576ef50cad18146639563783bb..0a9fa2a106ac940cee56163d48b3e72df1001f09 100644
--- a/analyzer/lib/src/generated/scanner.dart
+++ b/packages/analyzer/lib/src/generated/scanner.dart
@@ -1501,8 +1501,8 @@ class Scanner {
         }
         recordStartOfLine();
       } else if (next == 0xA) {
-        recordStartOfLine();
         next = _reader.advance();
+        recordStartOfLine();
       } else {
         next = _reader.advance();
       }
@@ -2010,9 +2010,7 @@ class Token {
   /**
    * Initialize a newly created token to have the given [type] and [offset].
    */
-  Token(this.type, int offset) {
-    this.offset = offset;
-  }
+  Token(this.type, this.offset);
 
   /**
    * Return the offset from the beginning of the file to the character after the