[kernel] Make fasta call a new constructor on FallThroughError

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 1528888cb06c7d89355eedec77e5feffa9af4bb7..657e1be992be10e7956710023fcf65226af27ef9 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -40,6 +40,8 @@ import 'package:kernel/core_types.dart' show CoreTypes;
 
 import 'frontend_accessors.dart' show buildIsNull, makeBinary, makeLet;
 
+import '../messages.dart' as messages show getLocationFromUri;
+
 import '../../scanner/token.dart' show BeginToken, Token;
 
 import '../scanner/token.dart' show isBinaryOperator, isMinusOperator;
@@ -2996,9 +2998,15 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
 
   Expression buildFallThroughError(int charOffset) {
     warningNotError("Switch case may fall through to next case.", charOffset);
-    Builder constructor = library.loader.getFallThroughError();
+
+    Location location = messages.getLocationFromUri(uri, charOffset);
+
     return new Throw(buildStaticInvocation(
-        constructor.target, new Arguments.empty(),
+        library.loader.coreTypes.fallThroughErrorUrlAndLineConstructor,
+        new Arguments(<Expression>[
+          new StringLiteral(location?.file ?? uri.toString()),
+          new IntLiteral(location?.line ?? 0)
+        ]),
         charOffset: charOffset));
   }