Handle const constructor invocation in kernel_impact.

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 bf9c1ab7b4190114223e2daefac81fe1f8e8c019..eeefe580d6703274a722ceff70f73c06092bc009 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2951,14 +2951,21 @@ class JavaScriptImpactTransformer extends ImpactTransformer {
     }
 
     for (StaticUse staticUse in worldImpact.staticUses) {
-      if (staticUse.kind == StaticUseKind.CLOSURE) {
-        registerBackendImpact(transformed, impacts.closure);
-        LocalFunctionElement closure = staticUse.element;
-        if (closure.type.containsTypeVariables) {
-          resolutionEnqueuer.universe.closuresWithFreeTypeVariables
-              .add(closure);
-          registerBackendImpact(transformed, impacts.computeSignature);
-        }
+      switch (staticUse.kind) {
+        case StaticUseKind.CLOSURE:
+          registerBackendImpact(transformed, impacts.closure);
+          LocalFunctionElement closure = staticUse.element;
+          if (closure.type.containsTypeVariables) {
+            resolutionEnqueuer.universe.closuresWithFreeTypeVariables
+                .add(closure);
+            registerBackendImpact(transformed, impacts.computeSignature);
+          }
+          break;
+        case StaticUseKind.CONST_CONSTRUCTOR_INVOKE:
+        case StaticUseKind.CONSTRUCTOR_INVOKE:
+          registerRequiredType(staticUse.type);
+          break;
+        default:
       }
     }
 
@@ -3144,11 +3151,18 @@ class JavaScriptImpactTransformer extends ImpactTransformer {
     }
 
     for (StaticUse staticUse in impact.staticUses) {
-      if (staticUse.kind == StaticUseKind.CLOSURE) {
-        LocalFunctionElement closure = staticUse.element;
-        if (backend.methodNeedsRti(closure)) {
-          registerBackendImpact(transformed, impacts.computeSignature);
-        }
+      switch (staticUse.kind) {
+        case StaticUseKind.CLOSURE:
+          LocalFunctionElement closure = staticUse.element;
+          if (backend.methodNeedsRti(closure)) {
+            registerBackendImpact(transformed, impacts.computeSignature);
+          }
+          break;
+        case StaticUseKind.CONST_CONSTRUCTOR_INVOKE:
+        case StaticUseKind.CONSTRUCTOR_INVOKE:
+          backend.lookupMapAnalysis.registerInstantiatedType(staticUse.type);

[Harry Terkelsen, 2016/10/07 15:53:21]

just a heads up: I think we are planning to remove lookup map support since it's
unused

[Johnni Winther, 2016/10/10 09:58:12]

Acknowledged.

+          break;
+        default:
       }
     }