Special case the recording of constant pool entries in the slot buffer.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index c966e2018e0e0c9b8ba87b02604dd91510e63b23..20cc71370a12dda1c44cce73374d6be872363c20 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -297,7 +297,8 @@ class SlotsBuffer {
   enum SlotType {
     EMBEDDED_OBJECT_SLOT,
     RELOCATED_CODE_OBJECT,
-    CODE_TARGET_SLOT,
+    CODE_TARGET_RELOC_INFO_SLOT,
+    CODE_TARGET_CONSTANT_POOL_SLOT,
     CODE_ENTRY_SLOT,
     DEBUG_TARGET_SLOT,
     JS_RETURN_SLOT,
@@ -310,8 +311,10 @@ class SlotsBuffer {
         return "EMBEDDED_OBJECT_SLOT";
       case RELOCATED_CODE_OBJECT:
         return "RELOCATED_CODE_OBJECT";
-      case CODE_TARGET_SLOT:
-        return "CODE_TARGET_SLOT";
+      case CODE_TARGET_RELOC_INFO_SLOT:
+        return "CODE_TARGET_RELOC_INFO_SLOT";
+      case CODE_TARGET_CONSTANT_POOL_SLOT:
+        return "CODE_TARGET_CONSTANT_POOL_SLOT";
       case CODE_ENTRY_SLOT:
         return "CODE_ENTRY_SLOT";
       case DEBUG_TARGET_SLOT: