Port r10674 to x64 and arm.

src/arm/builtins-arm.cc

Index: src/arm/builtins-arm.cc
diff --git a/src/arm/builtins-arm.cc b/src/arm/builtins-arm.cc
index 50b6bce30b7dddc4caeec098dd1e38464839d610..993addca9ee44263ebe6b1f5bdc246aa9a4d05b9 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -313,7 +313,7 @@ static void ArrayNativeCode(MacroAssembler* masm,
                             Label* call_generic_code) {
   Counters* counters = masm->isolate()->counters();
   Label argc_one_or_more, argc_two_or_more, not_empty_array, empty_array,
-      has_non_smi_element;
+      has_non_smi_element, finish, cant_transition_map, not_double;
 
   // Check for array construction with zero arguments or one.
   __ cmp(r0, Operand(0, RelocInfo::NONE));
@@ -418,6 +418,8 @@ static void ArrayNativeCode(MacroAssembler* masm,
   __ bind(&entry);
   __ cmp(r4, r5);
   __ b(lt, &loop);
+
+  __ bind(&finish);
   __ mov(sp, r7);
 
   // Remove caller arguments and receiver from the stack, setup return value and
@@ -430,8 +432,39 @@ static void ArrayNativeCode(MacroAssembler* masm,
   __ Jump(lr);
 
   __ bind(&has_non_smi_element);
+  // Double values are handled by the runtime.
+  __ CheckMap(
+      r2, r9, Heap::kHeapNumberMapRootIndex, &not_double, DONT_DO_SMI_CHECK);
+  __ bind(&cant_transition_map);
   __ UndoAllocationInNewSpace(r3, r4);
   __ b(call_generic_code);
+
+  __ bind(&not_double);
+  // Transition FAST_SMI_ONLY_ELEMENTS to FAST_ELEMENTS.
+  // r3: JSArray
+  __ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
+  __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+                                         FAST_ELEMENTS,
+                                         r2,
+                                         r9,
+                                         &cant_transition_map);
+  __ str(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
+  __ RecordWriteField(r3,
+                      HeapObject::kMapOffset,
+                      r2,
+                      r9,
+                      kLRHasNotBeenSaved,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+  Label loop2;
+  __ sub(r7, r7, Operand(kPointerSize));
+  __ bind(&loop2);
+  __ ldr(r2, MemOperand(r7, kPointerSize, PostIndex));
+  __ str(r2, MemOperand(r5, -kPointerSize, PreIndex));
+  __ cmp(r4, r5);
+  __ b(lt, &loop2);
+  __ b(&finish);
 }