Compute NativeBehavior for foreign functions.

pkg/compiler/lib/src/serialization/equivalence.dart

Index: pkg/compiler/lib/src/serialization/equivalence.dart
diff --git a/pkg/compiler/lib/src/serialization/equivalence.dart b/pkg/compiler/lib/src/serialization/equivalence.dart
index 9db38fdff5449eb60cdf9a853058ab4e520bce93..c9f03f285dbd8875ac58071c18058c074517c84e 100644
--- a/pkg/compiler/lib/src/serialization/equivalence.dart
+++ b/pkg/compiler/lib/src/serialization/equivalence.dart
@@ -990,7 +990,9 @@ bool testResolutionImpactEquivalence(
       strategy.testSets(impact1, impact2, 'staticUses', impact1.staticUses,
           impact2.staticUses, areStaticUsesEquivalent) &&
       strategy.testSets(impact1, impact2, 'typeUses', impact1.typeUses,
-          impact2.typeUses, areTypeUsesEquivalent);
+          impact2.typeUses, areTypeUsesEquivalent) &&
+      strategy.testSets(impact1, impact2, 'nativeData', impact1.nativeData,
+          impact2.nativeData, testNativeBehavior);
 }
 
 /// Tests the equivalence of [resolvedAst1] and [resolvedAst2] using [strategy].