Move DescriptorArray into the map

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 1a64c45369572fcff233ea8c1fbee391e35ddc0e..c17a466d4243302120a3c5d718a72e05a5041fc5 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2577,28 +2577,7 @@ void MacroAssembler::Abort(const char* msg) {
 
 void MacroAssembler::LoadInstanceDescriptors(Register map,
                                              Register descriptors) {
-  Register temp = descriptors;
-  mov(temp, FieldOperand(map, Map::kTransitionsOrBackPointerOffset));
-
-  Label ok, fail, load_from_back_pointer;
-  CheckMap(temp,
-           isolate()->factory()->fixed_array_map(),
-           &fail,
-           DONT_DO_SMI_CHECK);
-  mov(descriptors, FieldOperand(temp, TransitionArray::kDescriptorsOffset));
-  jmp(&ok);
-
-  bind(&fail);
-  cmp(temp, isolate()->factory()->undefined_value());
-  j(not_equal, &load_from_back_pointer, Label::kNear);
-  mov(descriptors, isolate()->factory()->empty_descriptor_array());
-  jmp(&ok);
-
-  bind(&load_from_back_pointer);
-  mov(temp, FieldOperand(temp, Map::kTransitionsOrBackPointerOffset));
-  mov(descriptors, FieldOperand(temp, TransitionArray::kDescriptorsOffset));
-
-  bind(&ok);
+  mov(descriptors, FieldOperand(map, Map::kDescriptorsOffset));
 }