Improve NSM handling.

pkg/front_end/lib/src/fasta/target_implementation.dart

Index: pkg/front_end/lib/src/fasta/target_implementation.dart
diff --git a/pkg/front_end/lib/src/fasta/target_implementation.dart b/pkg/front_end/lib/src/fasta/target_implementation.dart
index dd69f1c122b4e50ab87ee0f3c2359b89a8ef045a..7a7f3b4ab1b99c7368e16bbf9d5cca3b8116618d 100644
--- a/pkg/front_end/lib/src/fasta/target_implementation.dart
+++ b/pkg/front_end/lib/src/fasta/target_implementation.dart
@@ -6,8 +6,6 @@ library fasta.target_implementation;
 
 import 'package:kernel/target/targets.dart' as backend show Target;
 
-import 'package:kernel/ast.dart' show Arguments, Expression, Member;
-
 import 'builder/builder.dart' show Builder, ClassBuilder, LibraryBuilder;
 
 import 'parser/dart_vm_native.dart' as vm show skipNativeClause;
@@ -34,9 +32,7 @@ abstract class TargetImplementation extends Target {
   Builder cachedCompileTimeError;
   Builder cachedDuplicatedFieldInitializerError;
   Builder cachedFallThroughError;
-  Builder cachedInvocation;
   Builder cachedNativeAnnotation;
-  Builder cachedNoSuchMethodError;
 
   TargetImplementation(Ticker ticker, this.uriTranslator, this.backendTarget)
       : super(ticker);
@@ -101,21 +97,6 @@ abstract class TargetImplementation extends Target {
         loader.coreLibrary.getConstructor("FallThroughError");
   }
 
-  /// Returns a reference to the constructor of [Invocation]. The
-  /// constructor is expected to accept these arguments:
-  ///
-  ///     String functionName,
-  ///     List argumentsDescriptor,
-  ///     List arguments,
-  ///     bool isSuperInvocation
-  Builder getInvocation(Loader loader) {
-    if (cachedInvocation != null) {
-      return cachedInvocation;
-    }
-    return cachedInvocation = loader.coreLibrary
-        .getConstructor("_InvocationMirror", bypassLibraryPrivacy: true);
-  }
-
   /// Returns a reference to the constructor used for creating `native`
   /// annotations. The constructor is expected to accept a single argument of
   /// type String, which is the name of the native method.
@@ -125,22 +106,6 @@ abstract class TargetImplementation extends Target {
     return cachedNativeAnnotation = internal.getConstructor("ExternalName");
   }
 
-  /// Returns a reference to the constructor of [NoSuchMethodError] error. The
-  /// constructor is expected to accept these arguments:
-  ///
-  ///     Object receiver, // A class literal for static methods.
-  ///     Symbol memberName,
-  ///     int type, // [computeNoSuchMethodType](kernel/kernel_builder.dart).
-  ///     List positionalArguments,
-  ///     Map<Symbol, dynamic> namedArguments,
-  Builder getNoSuchMethodError(Loader loader) {
-    if (cachedNoSuchMethodError != null) {
-      return cachedNoSuchMethodError;
-    }
-    return cachedNoSuchMethodError = loader.coreLibrary
-        .getConstructor("NoSuchMethodError", constructorName: "_withType");
-  }
-
   void loadExtraRequiredLibraries(Loader loader) {
     for (String uri in backendTarget.extraRequiredLibraries) {
       loader.read(Uri.parse(uri), -1);
@@ -178,10 +143,4 @@ abstract class TargetImplementation extends Target {
       }
     }
   }
-
-  Expression instantiateInvocation(Member target, Expression receiver,
-      String name, Arguments arguments, int offset, bool isSuper) {
-    return backendTarget.instantiateInvocation(
-        target, receiver, name, arguments, offset, isSuper);
-  }
 }