[turbofan] Refactor the lowering of element/property accesses.

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index ab8ed0920a4c637b6c0bc67775c801ee287f2ec1..a7cd0e2497f74372b2eed759b8b386721493ed5e 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -226,6 +226,10 @@ class MaybeHandle final {
     }
   }
 
+  // Returns the raw address where this handle is stored. This should only be
+  // used for hashing handles; do not ever try to dereference it.
+  V8_INLINE Address address() const { return bit_cast<Address>(location_); }
+
   bool is_null() const { return location_ == nullptr; }
 
  protected: