Revert of Disallow subclassing Arrays.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index b8f63b40801644ca205cf26f6483cc55b8191818..3179972d4bdbdd3a91b5e401819654b3d227b559 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -3071,9 +3071,6 @@
 
   Register allocation_site = feedback_vector;
   __ Mov(allocation_site, scratch);
-
-  Register original_constructor = x3;
-  __ Mov(original_constructor, function);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
@@ -5009,13 +5006,11 @@
   //  -- x0 : argc (only if argument_count() == ANY)
   //  -- x1 : constructor
   //  -- x2 : AllocationSite or undefined
-  //  -- x3 : original constructor
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
   Register constructor = x1;
   Register allocation_site = x2;
-  Register original_constructor = x3;
 
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
@@ -5037,10 +5032,6 @@
     __ AssertUndefinedOrAllocationSite(allocation_site, x10);
   }
 
-  Label subclassing;
-  __ Cmp(original_constructor, constructor);
-  __ B(ne, &subclassing);
-
   Register kind = x3;
   Label no_info;
   // Get the elements kind and case on that.
@@ -5054,9 +5045,6 @@
 
   __ Bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
-
-  __ Bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
 }