Fix inobject slack tracking for both subclassing and non-subclassing cases.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 0fc2f211389ca323782422b981e2bbac0df3232a..ffc9357a9dc516779d54790ceb5aa7be1c390b12 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -9923,9 +9923,7 @@ void HOptimizedGraphBuilder::VisitCallNew(CallNew* expr) {
 
     // Force completion of inobject slack tracking before generating
     // allocation code to finalize instance size.
-    if (constructor->IsInobjectSlackTrackingInProgress()) {
-      constructor->CompleteInobjectSlackTracking();
-    }
+    constructor->CompleteInobjectSlackTrackingIfActive();
 
     // Calculate instance size from initial map of constructor.
     DCHECK(constructor->has_initial_map());