[heap] Fix binary size regression

This fixes the binary size regression introduced by https://chromium-review.googlesource.com/c/v8/v8/+/2247561

Bug: v8:11643
Change-Id: Ic615b1820620dc7bfadce3075ce04b4d6d1f4b64
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2831160
Commit-Queue: Wenyu Zhao <wenyu.zhao@anu.edu.au>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73998}

src/heap/marking-visitor.h

@@ -133,7 +133,7 @@ class MarkingVisitorBase : public HeapVisitor<int, ConcreteVisitor> {
   V8_INLINE int VisitWeakCell(Map map, WeakCell object);
 
   // ObjectVisitor overrides.
-  V8_INLINE void VisitMapPointer(HeapObject host) final {
+  void VisitMapPointer(HeapObject host) final {
     // Note that we are skipping the recording the slot because map objects
     // can't move, so this is safe (see ProcessStrongHeapObject for comparison)
     MarkObject(host, HeapObject::cast(host.map()));