Revert of [heap] Avoid the use of cells to point from code to new-space objects.

src/heap/remembered-set.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_REMEMBERED_SET_H
 #define V8_REMEMBERED_SET_H
 
 #include "src/assembler.h"
 #include "src/heap/heap.h"
 #include "src/heap/slot-set.h"
@@ skipping 327 matching lines @@
         return callback(reinterpret_cast<Object**>(addr));
       }
       case NUMBER_OF_SLOT_TYPES:
         break;
     }
     UNREACHABLE();
     return REMOVE_SLOT;
   }
 };
 
-inline SlotType SlotTypeForRelocInfoMode(RelocInfo::Mode rmode) {
-  if (RelocInfo::IsCodeTarget(rmode)) {
-    return CODE_TARGET_SLOT;
-  } else if (RelocInfo::IsCell(rmode)) {
-    return CELL_TARGET_SLOT;
-  } else if (RelocInfo::IsEmbeddedObject(rmode)) {
-    return EMBEDDED_OBJECT_SLOT;
-  } else if (RelocInfo::IsDebugBreakSlot(rmode)) {
-    return DEBUG_TARGET_SLOT;
-  }
-  UNREACHABLE();
-  return NUMBER_OF_SLOT_TYPES;
-}
-
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REMEMBERED_SET_H