Start unraveling circularities between analyzer and front_end/kernel.

pkg/analyzer/lib/src/fasta/ast_builder.dart

Index: pkg/analyzer/lib/src/fasta/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/analyzer/lib/src/fasta/ast_builder.dart
similarity index 99%
rename from pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
rename to pkg/analyzer/lib/src/fasta/ast_builder.dart
index 8a76b65331f62afcba2eb1923da53b2920d795e9..1c225ab1431a61e9014c7ccb930db75694e31c35 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/analyzer/lib/src/fasta/ast_builder.dart
@@ -9,15 +9,15 @@ import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
 import 'package:analyzer/dart/element/element.dart' show Element;
-import '../parser/parser.dart' show FormalParameterType;
-import '../scanner/token.dart' show BeginGroupToken, Token;
+import 'package:front_end/src/fasta/parser/parser.dart' show FormalParameterType;
+import 'package:front_end/src/fasta/scanner/token.dart' show BeginGroupToken, Token;
 
-import '../errors.dart' show internalError;
-import '../kernel/kernel_builder.dart'
+import 'package:front_end/src/fasta/errors.dart' show internalError;
+import 'package:front_end/src/fasta/kernel/kernel_builder.dart'
     show Builder, KernelLibraryBuilder, ProcedureBuilder;
-import '../parser/identifier_context.dart' show IdentifierContext;
-import '../quote.dart';
-import '../source/scope_listener.dart'
+import 'package:front_end/src/fasta/parser/identifier_context.dart' show IdentifierContext;
+import 'package:front_end/src/fasta/quote.dart';
+import 'package:front_end/src/fasta/source/scope_listener.dart'
     show JumpTargetKind, NullValue, Scope, ScopeListener;
 import 'analyzer.dart' show toKernel;
 import 'element_store.dart'