Less direct Compiler use in SSA

pkg/compiler/lib/src/native/ssa.dart

Index: pkg/compiler/lib/src/native/ssa.dart
diff --git a/pkg/compiler/lib/src/native/ssa.dart b/pkg/compiler/lib/src/native/ssa.dart
index 970a7e64a5a97a7a4b07fbb4db1c66aec286544c..70b022171a6aa8975c98dc25ed047e1ad8262338 100644
--- a/pkg/compiler/lib/src/native/ssa.dart
+++ b/pkg/compiler/lib/src/native/ssa.dart
@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import '../common.dart';
-import '../compiler.dart' show Compiler;
 import '../constants/values.dart';
 import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
@@ -18,11 +17,9 @@ import '../universe/side_effects.dart' show SideEffects;
 final RegExp nativeRedirectionRegExp = new RegExp(r'^[a-zA-Z][a-zA-Z_$0-9]*$');
 
 void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
-  Compiler compiler = builder.compiler;
   MethodElement element = builder.target;
   NativeEmitter nativeEmitter = builder.nativeEmitter;
   JavaScriptBackend backend = builder.backend;
-  DiagnosticReporter reporter = compiler.reporter;
 
   HInstruction convertDartClosure(
       ParameterElement parameter, ResolutionFunctionType type) {
@@ -53,7 +50,7 @@ void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
     LiteralString jsCode = nativeBody.asLiteralString();
     String str = jsCode.dartString.slowToString();
     if (nativeRedirectionRegExp.hasMatch(str)) {
-      reporter.internalError(
+      throw new SpannableAssertionFailure(
           nativeBody, "Deprecated syntax, use @JSName('name') instead.");
     }
     hasBody = true;
@@ -93,8 +90,8 @@ void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
     } else if (element.kind == ElementKind.SETTER) {
       nativeMethodCall = '$receiver$nativeMethodName = $foreignParameters';
     } else {
-      builder.reporter
-          .internalError(element, 'Unexpected kind: "${element.kind}".');
+      throw new SpannableAssertionFailure(
+          element, 'Unexpected kind: "${element.kind}".');
     }
 
     builder.push(new HForeignCode(
@@ -111,7 +108,7 @@ void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
         .addSuccessor(builder.graph.exit);
   } else {
     if (parameters.parameterCount != 0) {
-      reporter.internalError(
+      throw new SpannableAssertionFailure(
           nativeBody,
           'native "..." syntax is restricted to '
           'functions with zero parameters.');