VectorICs: use a vector slot to aid in array literal processing.

src/full-codegen/arm64/full-codegen-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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
@@ skipping 1767 matching lines @@
     // is already set in the cloned array.
     if (CompileTimeValue::IsCompileTimeValue(subexpr)) continue;
 
     if (!result_saved) {
       __ Mov(x1, Smi::FromInt(expr->literal_index()));
       __ Push(x0, x1);
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
-    if (has_fast_elements) {
+    if (FLAG_vector_stores) {
+      __ Mov(StoreDescriptor::NameRegister(), Smi::FromInt(array_index));
+      __ Peek(StoreDescriptor::ReceiverRegister(), kPointerSize);
+      EmitLoadStoreICSlot(expr->LiteralFeedbackSlot());
+      Handle<Code> ic =
+          CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
+      CallIC(ic);
+    } else if (has_fast_elements) {
       int offset = FixedArray::kHeaderSize + (array_index * kPointerSize);
       __ Peek(x6, kPointerSize);  // Copy of array literal.
       __ Ldr(x1, FieldMemOperand(x6, JSObject::kElementsOffset));
       __ Str(result_register(), FieldMemOperand(x1, offset));
       // Update the write barrier for the array store.
       __ RecordWriteField(x1, offset, result_register(), x10,
                           kLRHasBeenSaved, kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET, INLINE_SMI_CHECK);
     } else {
       __ Mov(x3, Smi::FromInt(array_index));
@@ skipping 3468 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64