Move DescriptorArray into the map

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 489eeb05fc492efd32889ffae381daae32d6d629..dacfc0ed5c8a74b6bc40142f2b48cf10374b0f8e 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -5304,29 +5304,7 @@ void MacroAssembler::EnsureNotWhite(
 void MacroAssembler::LoadInstanceDescriptors(Register map,
                                              Register descriptors,
                                              Register scratch) {
-  Register temp = descriptors;
-  lw(temp, FieldMemOperand(map, Map::kTransitionsOrBackPointerOffset));
-
-  Label ok, fail, load_from_back_pointer;
-  CheckMap(temp,
-           scratch,
-           isolate()->factory()->fixed_array_map(),
-           &fail,
-           DONT_DO_SMI_CHECK);
-  lw(descriptors, FieldMemOperand(temp, TransitionArray::kDescriptorsOffset));
-  jmp(&ok);
-
-  bind(&fail);
-  LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
-  Branch(&load_from_back_pointer, ne, temp, Operand(scratch));
-  LoadRoot(descriptors, Heap::kEmptyDescriptorArrayRootIndex);
-  jmp(&ok);
-
-  bind(&load_from_back_pointer);
-  lw(temp, FieldMemOperand(temp, Map::kTransitionsOrBackPointerOffset));
-  lw(descriptors, FieldMemOperand(temp, TransitionArray::kDescriptorsOffset));
-
-  bind(&ok);
+  lw(descriptors, FieldMemOperand(map, Map::kDescriptorsOffset));
 }