Start making constructor elements lazy.

pkg/analyzer/lib/src/summary/resynthesize.dart

Index: pkg/analyzer/lib/src/summary/resynthesize.dart
diff --git a/pkg/analyzer/lib/src/summary/resynthesize.dart b/pkg/analyzer/lib/src/summary/resynthesize.dart
index 0b3ac6b21cba5e9510d462425590fd2a0430bcac..0cb986d52f044cf2262dd1a45f12e03ef250bbff 100644
--- a/pkg/analyzer/lib/src/summary/resynthesize.dart
+++ b/pkg/analyzer/lib/src/summary/resynthesize.dart
@@ -1780,16 +1780,7 @@ class _UnitResynthesizer {
       ClassElementImpl classElement, ElementHolder holder) {
     assert(serializedExecutable.kind == UnlinkedExecutableKind.constructor);
     currentConstructor = new ConstructorElementImpl.forSerialized(
-        serializedExecutable, classElement);
-    currentConstructor.isCycleFree = serializedExecutable.isConst &&
-        !constCycles.contains(serializedExecutable.constCycleSlot);
-    if (serializedExecutable.name.isEmpty) {
-      currentConstructor.nameEnd =
-          serializedExecutable.nameOffset + classElement.name.length;
-    } else {
-      currentConstructor.nameEnd = serializedExecutable.nameEnd;
-      currentConstructor.periodOffset = serializedExecutable.periodOffset;
-    }
+        serializedExecutable, constCycles, classElement);
     constructors[serializedExecutable.name] = currentConstructor;
     currentConstructor.constantInitializers = serializedExecutable
         .constantInitializers