[ext-code-space] Fix code bloat on Android builds

... introduced in
https://chromium-review.googlesource.com/c/v8/v8/+/3182231

Bug: v8:11880, chromium:1254494
Change-Id: I40bdb5b062adc74ed1dc63d9a334184fcac451b8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3212509
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77297}

src/heap/marking-visitor-inl.h

@@ -20,15 +20,6 @@ namespace internal {
 // Visiting strong and weak pointers =========================================
 // ===========================================================================
 
-template <typename ConcreteVisitor, typename MarkingState>
-void MarkingVisitorBase<ConcreteVisitor, MarkingState>::VisitMapPointer(
-    HeapObject host) {
-  // 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(ObjectVisitorWithCageBases::cage_base())));
-}
-
 template <typename ConcreteVisitor, typename MarkingState>
 void MarkingVisitorBase<ConcreteVisitor, MarkingState>::MarkObject(
     HeapObject host, HeapObject object) {

src/heap/marking-visitor.h

@@ -136,7 +136,12 @@ 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(ObjectVisitorWithCageBases::cage_base())));
+  }
   V8_INLINE void VisitPointer(HeapObject host, ObjectSlot p) final {
     VisitPointersImpl(host, p, p + 1);
   }