[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/context-measure.cc

Index: src/context-measure.cc
diff --git a/src/context-measure.cc b/src/context-measure.cc
index 342362983dba0c3f17a894733e927bfff199497b..07075840fd8e04c749836d44962d93bb689ab71c 100644
--- a/src/context-measure.cc
+++ b/src/context-measure.cc
@@ -18,7 +18,7 @@ ContextMeasure::ContextMeasure(Context* context)
       count_(0),
       size_(0) {
   DCHECK(context_->IsNativeContext());
-  Object* next_link = context_->get(Context::NEXT_CONTEXT_LINK);
+  Object* next_link = context_->next_context_link();
   MeasureObject(context_);
   MeasureDeferredObjects();
   context_->set(Context::NEXT_CONTEXT_LINK, next_link);