Revert of Disallow subclassing Arrays.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 5509dde33b9852c51a1c08c60cc01be7535db397..c952a8acf0cac59650fe7177c30756d419f2a6fd 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -2886,7 +2886,6 @@
   __ Branch(&miss, ne, a5, Operand(at));
 
   __ mov(a2, a4);
-  __ mov(a3, a1);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
@@ -4843,7 +4842,6 @@
   //  -- a0 : argc (only if argument_count() == ANY)
   //  -- a1 : constructor
   //  -- a2 : AllocationSite or undefined
-  //  -- a3 : original constructor
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
@@ -4866,9 +4864,6 @@
     __ AssertUndefinedOrAllocationSite(a2, a4);
   }
 
-  Label subclassing;
-  __ Branch(&subclassing, ne, a1, Operand(a3));
-
   Label no_info;
   // Get the elements kind and case on that.
   __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
@@ -4882,9 +4877,6 @@
 
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
-
-  __ bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
 }