[turbofan] Make FieldAccess::name usable in practice.

test/unittests/compiler/change-lowering-unittest.cc

Index: test/unittests/compiler/change-lowering-unittest.cc
diff --git a/test/unittests/compiler/change-lowering-unittest.cc b/test/unittests/compiler/change-lowering-unittest.cc
index cd6ac5869ae1159f4e8eda4569ca40fa6e18e5e3..e138767b80aeb409966580cd7125956785286cee 100644
--- a/test/unittests/compiler/change-lowering-unittest.cc
+++ b/test/unittests/compiler/change-lowering-unittest.cc
@@ -182,9 +182,8 @@ TARGET_TEST_P(ChangeLoweringCommonTest, ChangeTaggedToUint32WithTaggedPointer) {
 
 
 TARGET_TEST_P(ChangeLoweringCommonTest, StoreFieldSmi) {
-  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize,
-                        Handle<Name>::null(), Type::Any(),
-                        MachineType::AnyTagged()};
+  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize, nullptr,
+                        Type::Any(), MachineType::AnyTagged()};
   Node* p0 = Parameter(Type::TaggedPointer());
   Node* p1 = Parameter(Type::TaggedSigned());
   Node* store = graph()->NewNode(simplified()->StoreField(access), p0, p1,
@@ -201,9 +200,8 @@ TARGET_TEST_P(ChangeLoweringCommonTest, StoreFieldSmi) {
 
 
 TARGET_TEST_P(ChangeLoweringCommonTest, StoreFieldTagged) {
-  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize,
-                        Handle<Name>::null(), Type::Any(),
-                        MachineType::AnyTagged()};
+  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize, nullptr,
+                        Type::Any(), MachineType::AnyTagged()};
   Node* p0 = Parameter(Type::TaggedPointer());
   Node* p1 = Parameter(Type::Tagged());
   Node* store = graph()->NewNode(simplified()->StoreField(access), p0, p1,
@@ -220,9 +218,8 @@ TARGET_TEST_P(ChangeLoweringCommonTest, StoreFieldTagged) {
 
 
 TARGET_TEST_P(ChangeLoweringCommonTest, LoadField) {
-  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize,
-                        Handle<Name>::null(), Type::Any(),
-                        MachineType::AnyTagged()};
+  FieldAccess access = {kTaggedBase, FixedArrayBase::kHeaderSize, nullptr,
+                        Type::Any(), MachineType::AnyTagged()};
   Node* p0 = Parameter(Type::TaggedPointer());
   Node* load = graph()->NewNode(simplified()->LoadField(access), p0,
                                 graph()->start(), graph()->start());