[runtime] Introduce a proper %NewArray runtime entry.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 5197 matching lines @@
            UntagSmiFieldMemOperand(allocation_site,
                                    AllocationSite::kTransitionInfoOffset));
   __ And(kind, kind, AllocationSite::ElementsKindBits::kMask);
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ Bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 
   // Subclassing support.
   __ Bind(&subclassing);
-  __ Push(constructor, new_target);
-  // Adjust argc.
   switch (argument_count()) {
     case ANY:
     case MORE_THAN_ONE:
-      __ add(x0, x0, Operand(2));
+      __ Poke(constructor, Operand(x0, LSL, kPointerSizeLog2));
+      __ Add(x0, x0, Operand(3));
       break;
     case NONE:
-      __ Mov(x0, Operand(2));
+      __ Poke(constructor, 0 * kPointerSize);
+      __ Mov(x0, Operand(3));
       break;
     case ONE:
-      __ Mov(x0, Operand(3));
+      __ Poke(constructor, 1 * kPointerSize);
+      __ Mov(x0, Operand(4));
       break;
   }
-  __ JumpToExternalReference(
-      ExternalReference(Runtime::kArrayConstructorWithSubclassing, isolate()));
+  __ Push(new_target, allocation_site);
+  __ JumpToExternalReference(ExternalReference(Runtime::kNewArray, isolate()));
 }
 
 
 void InternalArrayConstructorStub::GenerateCase(
     MacroAssembler* masm, ElementsKind kind) {
   Label zero_case, n_case;
   Register argc = x0;
 
   __ Cbz(argc, &zero_case);
   __ CompareAndBranch(argc, 1, ne, &n_case);
@@ skipping 570 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64