Implement 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..8e9fd03fb008cb81329886de6d018f6e34e656a4 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -4844,8 +4844,7 @@ void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   //  -- a1 : constructor
   //  -- a2 : AllocationSite or undefined
   //  -- a3 : original constructor
-  //  -- sp[0] : return address
-  //  -- sp[4] : last argument
+  //  -- sp[0] : last argument
   // -----------------------------------
 
   if (FLAG_debug_code) {
@@ -4883,8 +4882,28 @@ void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 
+  // Subclassing.
   __ bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
+  __ Push(a1);
+  __ Push(a3);
+
+  // Adjust argc.
+  switch (argument_count()) {
+    case ANY:
+    case MORE_THAN_ONE:
+      __ li(at, Operand(2));
+      __ addu(a0, a0, at);
+      break;
+    case NONE:
+      __ li(a0, Operand(2));
+      break;
+    case ONE:
+      __ li(a0, Operand(3));
+      break;
+  }
+
+  __ JumpToExternalReference(
+      ExternalReference(Runtime::kArrayConstructorWithSubclassing, isolate()));
 }