Introduce flag --allocation-site-transitioning

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index e2508e76dcd66fd02a2526461abd73b655f54294..f7ecdf85251ac5ded1b202b5bb8f52ee00f205b5 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -8995,6 +8995,12 @@ bool HOptimizedGraphBuilder::TryHandleArrayCallNew(CallNew* expr,
     return false;
   }
 
+  // Special handling for array construction only makes sense if we are
+  // using allocation sites.
+  if (!FLAG_allocation_site_transitioning) {
+    return false;
+  }
+
   BuildArrayCall(expr,
                  expr->arguments()->length(),
                  function,
@@ -9245,10 +9251,9 @@ bool HOptimizedGraphBuilder::IsCallArrayInlineable(
   Handle<JSFunction> target = array_function();
   // We should have the function plus array arguments on the environment stack.
   DCHECK(environment()->length() >= (argument_count + 1));
-  DCHECK(!site.is_null());
 
   bool inline_ok = false;
-  if (site->CanInlineCall()) {
+  if (!site.is_null() && site->CanInlineCall()) {
     // We also want to avoid inlining in certain 1 argument scenarios.
     if (argument_count == 1) {
       HValue* argument = Top();