Break allocations in the code serializer into correct chunk sizes.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 5be9c3a11fdfbe4d7659786217ff74dd83304bd0..1944464a7c7e75946127e4a2390055c116e2a4cf 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -1104,6 +1104,12 @@ class MemoryAllocator {
     return CodePageAreaEndOffset() - CodePageAreaStartOffset();
   }
 
+  static int PageAreaSize(AllocationSpace space) {
+    DCHECK_NE(LO_SPACE, space);
+    return (space == CODE_SPACE) ? CodePageAreaSize()
+                                 : Page::kMaxRegularHeapObjectSize;
+  }
+
   MUST_USE_RESULT bool CommitExecutableMemory(base::VirtualMemory* vm,
                                               Address start, size_t commit_size,
                                               size_t reserved_size);