[heap] Remove left-overs of RESCAN_ON_EVACUATION flag.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 32513b7c960b4d78f606eeade15fa0987a5943ed..0e4604f95125ee76aee248dd15748e324fdc42c1 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -300,7 +300,6 @@ class MemoryChunk {
     IN_TO_SPACE,    // All pages in new space has one of these two set.
     NEW_SPACE_BELOW_AGE_MARK,
     EVACUATION_CANDIDATE,
-    RESCAN_ON_EVACUATION,
     NEVER_EVACUATE,  // May contain immortal immutables.
 
     // Large objects can have a progress bar in their page header. These object
@@ -355,8 +354,7 @@ class MemoryChunk {
   static const int kEvacuationCandidateMask = 1 << EVACUATION_CANDIDATE;
 
   static const int kSkipEvacuationSlotsRecordingMask =
-      (1 << EVACUATION_CANDIDATE) | (1 << RESCAN_ON_EVACUATION) |
-      (1 << IN_FROM_SPACE) | (1 << IN_TO_SPACE);
+      (1 << EVACUATION_CANDIDATE) | (1 << IN_FROM_SPACE) | (1 << IN_TO_SPACE);
 
   static const intptr_t kAlignment =
       (static_cast<uintptr_t>(1) << kPageSizeBits);