[heap] Fix component build

Change-Id: I88ea54d02bb6600acc1105dce112285c68861007
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3423667Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78853}

src/heap/mark-compact.h

@@ -511,7 +511,7 @@ class MarkCompactCollector final : public MarkCompactCollectorBase {
     uint32_t offset;
   };
 
-  static bool IsMapOrForwardedMap(Map map);
+  static V8_EXPORT_PRIVATE bool IsMapOrForwardedMap(Map map);
 
   static bool ShouldRecordRelocSlot(Code host, RelocInfo* rinfo,
                                     HeapObject target);