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

src/heap/remembered-set.h

Index: src/heap/remembered-set.h
diff --git a/src/heap/remembered-set.h b/src/heap/remembered-set.h
index 339748cbd723e5aedd36906e721924e98e54244c..ab5badf5cd05e811d8a34a3f8347cdd0b41ccbe9 100644
--- a/src/heap/remembered-set.h
+++ b/src/heap/remembered-set.h
@@ -345,6 +345,20 @@ class UpdateTypedSlotHelper {
   }
 };
 
+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