Add an AST factory method for fieldDeclaration with all optional named parameters.

pkg/analyzer/lib/src/generated/parser.dart

Index: pkg/analyzer/lib/src/generated/parser.dart
diff --git a/pkg/analyzer/lib/src/generated/parser.dart b/pkg/analyzer/lib/src/generated/parser.dart
index c785abefddc635c43f31218ce587c73ec549a26a..e8bc7dd5d908187636ff18c9c417df3423376aa7 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -1338,15 +1338,13 @@ class Parser {
         VariableDeclaration variable = astFactory.variableDeclaration(
             createSyntheticIdentifier(), null, null);
         List<VariableDeclaration> variables = <VariableDeclaration>[variable];
-        FieldDeclarationImpl field = astFactory.fieldDeclaration(
-            commentAndMetadata.comment,
-            commentAndMetadata.metadata,
-            null,
-            astFactory.variableDeclarationList(
+        return astFactory.fieldDeclaration2(
+            comment: commentAndMetadata.comment,
+            metadata: commentAndMetadata.metadata,
+            covariantKeyword: modifiers.covariantKeyword,
+            fieldList: astFactory.variableDeclarationList(
                 null, null, keyword, null, variables),
-            _expect(TokenType.SEMICOLON));
-        field.covariantKeyword = modifiers.covariantKeyword;
-        return field;
+            semicolon: _expect(TokenType.SEMICOLON));
       }
       _reportErrorForToken(
           ParserErrorCode.EXPECTED_CLASS_MEMBER, _currentToken);
@@ -3584,14 +3582,13 @@ class Parser {
       TypeAnnotation type) {
     VariableDeclarationList fieldList =
         parseVariableDeclarationListAfterType(null, keyword, type);
-    FieldDeclarationImpl field = astFactory.fieldDeclaration(
-        commentAndMetadata.comment,
-        commentAndMetadata.metadata,
-        staticKeyword,
-        fieldList,
-        _expect(TokenType.SEMICOLON));
-    field.covariantKeyword = covariantKeyword;
-    return field;
+    return astFactory.fieldDeclaration2(
+        comment: commentAndMetadata.comment,
+        metadata: commentAndMetadata.metadata,
+        covariantKeyword: covariantKeyword,
+        staticKeyword: staticKeyword,
+        fieldList: fieldList,
+        semicolon: _expect(TokenType.SEMICOLON));
   }
 
   /**