Support deserialization of ResolutionImpact for members of unnamed mixin applications

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index fc3aed9568803886a58d210bef2039a4ab8caa5b..f1fb2b0fe719356f35f358b4b6b49c47f5a956cb 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1872,6 +1872,9 @@ class _CompilerResolution implements Resolution {
   bool hasResolutionImpact(Element element) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration."));
+    if (compiler.serialization.isDeserialized(element)) {
+      return compiler.serialization.hasResolutionImpact(element);
+    }
     return _resolutionImpactCache.containsKey(element);
   }
 
@@ -1879,7 +1882,12 @@ class _CompilerResolution implements Resolution {
   ResolutionImpact getResolutionImpact(Element element) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration."));
-    ResolutionImpact resolutionImpact = _resolutionImpactCache[element];
+    ResolutionImpact resolutionImpact;
+    if (compiler.serialization.isDeserialized(element)) {
+      resolutionImpact = compiler.serialization.getResolutionImpact(element);
+    } else {
+      resolutionImpact = _resolutionImpactCache[element];
+    }
     assert(invariant(element, resolutionImpact != null,
         message: "ResolutionImpact not available for $element."));
     return resolutionImpact;
@@ -1904,6 +1912,7 @@ class _CompilerResolution implements Resolution {
       Node tree = compiler.parser.parse(element);
       assert(invariant(element, !element.isSynthesized || tree == null));
       ResolutionImpact resolutionImpact = compiler.resolver.resolve(element);
+
       if (compiler.serialization.supportSerialization ||
           retainCachesForTesting) {
         // [ResolutionImpact] is currently only used by serialization. The