Port FastCloneShallowArrayStub to Turbofan

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index e5332a2f5d1a961c6a9eb69da3b29d6390bd22d0..b8190efb7f666985a6d6b03cadde632bcf175192 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -3226,93 +3226,6 @@ void HGraphBuilder::BuildCopyElements(HValue* from_elements,
   AddIncrementCounter(counters->inlined_copied_elements());
 }
 
-
-HValue* HGraphBuilder::BuildCloneShallowArrayCow(HValue* boilerplate,
-                                                 HValue* allocation_site,
-                                                 AllocationSiteMode mode,
-                                                 ElementsKind kind) {
-  HAllocate* array = AllocateJSArrayObject(mode);
-
-  HValue* map = AddLoadMap(boilerplate);
-  HValue* elements = AddLoadElements(boilerplate);
-  HValue* length = AddLoadArrayLength(boilerplate, kind);
-
-  BuildJSArrayHeader(array,
-                     map,
-                     elements,
-                     mode,
-                     FAST_ELEMENTS,
-                     allocation_site,
-                     length);
-  return array;
-}
-
-
-HValue* HGraphBuilder::BuildCloneShallowArrayEmpty(HValue* boilerplate,
-                                                   HValue* allocation_site,
-                                                   AllocationSiteMode mode) {
-  HAllocate* array = AllocateJSArrayObject(mode);
-
-  HValue* map = AddLoadMap(boilerplate);
-
-  BuildJSArrayHeader(array,
-                     map,
-                     NULL,  // set elements to empty fixed array
-                     mode,
-                     FAST_ELEMENTS,
-                     allocation_site,
-                     graph()->GetConstant0());
-  return array;
-}
-
-
-HValue* HGraphBuilder::BuildCloneShallowArrayNonEmpty(HValue* boilerplate,
-                                                      HValue* allocation_site,
-                                                      AllocationSiteMode mode,
-                                                      ElementsKind kind) {
-  HValue* boilerplate_elements = AddLoadElements(boilerplate);
-  HValue* capacity = AddLoadFixedArrayLength(boilerplate_elements);
-
-  // Generate size calculation code here in order to make it dominate
-  // the JSArray allocation.
-  HValue* elements_size = BuildCalculateElementsSize(kind, capacity);
-
-  // Create empty JSArray object for now, store elimination should remove
-  // redundant initialization of elements and length fields and at the same
-  // time the object will be fully prepared for GC if it happens during
-  // elements allocation.
-  HValue* result = BuildCloneShallowArrayEmpty(
-      boilerplate, allocation_site, mode);
-
-  HAllocate* elements = BuildAllocateElements(kind, elements_size);
-
-  Add<HStoreNamedField>(result, HObjectAccess::ForElementsPointer(), elements);
-
-  // The allocation for the cloned array above causes register pressure on
-  // machines with low register counts. Force a reload of the boilerplate
-  // elements here to free up a register for the allocation to avoid unnecessary
-  // spillage.
-  boilerplate_elements = AddLoadElements(boilerplate);
-  boilerplate_elements->SetFlag(HValue::kCantBeReplaced);
-
-  // Copy the elements array header.
-  for (int i = 0; i < FixedArrayBase::kHeaderSize; i += kPointerSize) {
-    HObjectAccess access = HObjectAccess::ForFixedArrayHeader(i);
-    Add<HStoreNamedField>(
-        elements, access,
-        Add<HLoadNamedField>(boilerplate_elements, nullptr, access));
-  }
-
-  // And the result of the length
-  HValue* length = AddLoadArrayLength(boilerplate, kind);
-  Add<HStoreNamedField>(result, HObjectAccess::ForArrayLength(kind), length);
-
-  BuildCopyElements(boilerplate_elements, kind, elements,
-                    kind, length, NULL);
-  return result;
-}
-
-
 void HGraphBuilder::BuildCreateAllocationMemento(
     HValue* previous_object,
     HValue* previous_object_size,