Add LookupTable class for finding classes and members by name.

pkg/kernel/lib/transformations/mixin_full_resolution.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.transformations.mixin_full_resolution;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../clone.dart';
 import '../core_types.dart';
 import '../type_algebra.dart';
@@ skipping 253 matching lines @@
       return new DirectMethodInvocation(
           new ThisExpression(), noSuchMethod, new Arguments([invocationPrime]))
         ..fileOffset = node.fileOffset;
     }
   }
 
   /// Creates an "new _InvocationMirror(...)" invocation.
   ConstructorInvocation _createInvocation(String methodName,
       Arguments callArguments, bool isSuperInvocation, Expression receiver) {
     if (_invocationMirrorConstructor == null) {
-      Class clazz = coreTypes.getCoreClass('dart:core', '_InvocationMirror');
+      Class clazz = coreTypes.getClass('dart:core', '_InvocationMirror');
       _invocationMirrorConstructor = clazz.constructors[0];
     }
 
     // The _InvocationMirror constructor takes the following arguments:
     // * Method name (a string).
     // * An arguments descriptor - a list consisting of:
     //   - number of arguments (including receiver).
     //   - number of positional arguments (including receiver).
     //   - pairs (2 entries in the list) of
     //     * named arguments name.
@@ skipping 23 matching lines @@
         new Arguments([
           new StringLiteral(methodName),
           _fixedLengthList(argumentsDescriptor),
           _fixedLengthList(arguments),
           new BoolLiteral(isSuperInvocation)
         ]));
   }
 
   /// Create a fixed length list containing given expressions.
   Expression _fixedLengthList(List<Expression> list) {
-    if (_listFrom == null) {
-      Class clazz = coreTypes.getCoreClass('dart:core', 'List');
-      _listFrom = clazz.procedures.firstWhere((c) => c.name.name == "from");
-    }
+    _listFrom ??= coreTypes.getMember('dart:core', 'List', 'from');
     return new StaticInvocation(
         _listFrom,
         new Arguments([new ListLiteral(list)],
             named: [new NamedExpression("growable", new BoolLiteral(false))],
             types: [const DynamicType()]));
   }
 
   /// Check that a call to the targetFunction is legal given the arguments.
   ///
   /// I.e. check that the number of positional parameters and the names of the
@@ skipping 39 matching lines @@
           return null;
         }
       }
 
       throw new Exception(
           'Could not find a generative constructor named "${constructor.name}" '
           'in lookup class "${lookupClass.name}"!');
     }
   }
 }