[heap] TPH cannot assume chunks

Bug: v8:9533
Change-Id: Ia47af94bd24b3f9a8a3d39f79a8ed61f4f2d53ab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2047048Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Steve Blackburn <steveblackburn@google.com>
Cr-Commit-Position: refs/heads/master@{#66212}

src/heap/heap-write-barrier-inl.h

@@ -61,6 +61,7 @@ struct MemoryChunk {
 
   V8_INLINE static heap_internals::MemoryChunk* FromHeapObject(
       HeapObject object) {
+    DCHECK(!V8_ENABLE_THIRD_PARTY_HEAP_BOOL);
     return reinterpret_cast<MemoryChunk*>(object.ptr() & ~kPageAlignmentMask);
   }
 

src/heap/spaces.h

@@ -641,10 +641,12 @@ class MemoryChunk : public BasicMemoryChunk {
 
   // Only works if the pointer is in the first kPageSize of the MemoryChunk.
   static MemoryChunk* FromAddress(Address a) {
+    DCHECK(!V8_ENABLE_THIRD_PARTY_HEAP_BOOL);
     return reinterpret_cast<MemoryChunk*>(BaseAddress(a));
   }
   // Only works if the object is in the first kPageSize of the MemoryChunk.
   static MemoryChunk* FromHeapObject(HeapObject o) {
+    DCHECK(!V8_ENABLE_THIRD_PARTY_HEAP_BOOL);
     return reinterpret_cast<MemoryChunk*>(BaseAddress(o.ptr()));
   }