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

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index 3821a6de57deed81ca59be8c49682d0dfca4ed5e..cff735cc897d6a3d5d883e313501ec4227298f5b 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -63,7 +63,7 @@ BufferAccess const BufferAccessOf(const Operator* op) WARN_UNUSED_RESULT;
 struct FieldAccess {
   BaseTaggedness base_is_tagged;  // specifies if the base pointer is tagged.
   int offset;                     // offset of the field, without tag.
-  MaybeHandle<Name> name;         // debugging only.
+  const char* name;               // debugging only.
   Type* type;                     // type of the field.
   MachineType machine_type;       // machine type of the field.