Temporarily disable overlapping summary check

pkg/dev_compiler/lib/src/compiler/compiler.dart

Index: pkg/dev_compiler/lib/src/compiler/compiler.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/compiler.dart b/pkg/dev_compiler/lib/src/compiler/compiler.dart
index e958e44939657332fd555cc28e7b3686b7992ab6..2df03f45418ccd3ef57ae741c35abb36310cd1c4 100644
--- a/pkg/dev_compiler/lib/src/compiler/compiler.dart
+++ b/pkg/dev_compiler/lib/src/compiler/compiler.dart
@@ -90,7 +90,8 @@ class ModuleCompiler {
     summaryData ??= new SummaryDataStore(options.summaryPaths,
         resourceProvider: resourceProvider,
         recordDependencyInfo: true,
-        disallowOverlappingSummaries: true);
+        // TODO(vsm): Reset this to true once we cleanup internal build rules.
+        disallowOverlappingSummaries: false);
 
     var sdkSummaryBundle = sdk.getLinkedBundle();
     if (sdkSummaryBundle != null) {