Revert of Disallow subclassing Arrays.

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index 795469998372545bfe05ac0d0f58c1ea4c7bd947..74705f97efdd8947c992589abb81974d574a789d 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -2808,7 +2808,6 @@
   __ Branch(&miss, ne, t1, Operand(at));
 
   __ mov(a2, t0);
-  __ mov(a3, a1);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
@@ -4800,7 +4799,6 @@
   //  -- a0 : argc (only if argument_count() == ANY)
   //  -- a1 : constructor
   //  -- a2 : AllocationSite or undefined
-  //  -- a3 : Original constructor
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
@@ -4823,9 +4821,6 @@
     __ AssertUndefinedOrAllocationSite(a2, t0);
   }
 
-  Label subclassing;
-  __ Branch(&subclassing, ne, a1, Operand(a3));
-
   Label no_info;
   // Get the elements kind and case on that.
   __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
@@ -4839,9 +4834,6 @@
 
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
-
-  __ bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
 }