Compute ResolutionImpact directly from kernel, part 1 of ?

pkg/compiler/lib/src/js_backend/backend.dart

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index e813fe938a9f6e0dee1eefc47ca68fd2d6172d24..8c2f26ad9a7bd531da3b7a1160ce4b249866cf5f 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -635,7 +635,7 @@ class JavaScriptBackend extends Backend {
   JavaScriptConstantCompiler get constants {
     return constantCompilerTask.jsConstantCompiler;
   }
-  
+
   @override
   bool isDefaultNoSuchMethod(MethodElement element) {
     return noSuchMethodRegistry.isDefaultNoSuchMethodImplementation(element);