Don't compute library cycle when the library is resynthesized.

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index 59ffdd871595011f80982ea23043cef491db9775..56595c47e6ad7cf9cdef8a04f76406609c94de50 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -2211,8 +2211,10 @@ class ComputeLibraryCycleTask extends SourceBasedAnalysisTask {
     // re-run if anything reachable from this target has been invalidated,
     // and the invalidation code (invalidateLibraryCycles) will ensure that
     // element model results will be re-used here only if they are still valid.
-    if (context.analysisOptions.strongMode) {
-      LibraryElement library = getRequiredInput(LIBRARY_ELEMENT_INPUT);
+    LibraryElement library = getRequiredInput(LIBRARY_ELEMENT_INPUT);
+    if (context.analysisOptions.strongMode &&
+        !LibraryElementImpl.hasResolutionCapability(
+            library, LibraryResolutionCapability.resolvedTypeNames)) {
       List<LibraryElement> component = library.libraryCycle;
       Set<LibraryElement> filter = component.toSet();
       Set<CompilationUnitElement> deps = new Set<CompilationUnitElement>();