[heap] Evacuation for young generation

src/heap/spaces-inl.h

Index: src/heap/spaces-inl.h
diff --git a/src/heap/spaces-inl.h b/src/heap/spaces-inl.h
index 52c572cc4a65078687ced45fb55359b59ea2ad2b..5b44d1dc10915381c0a316c86ac483606ffe5e26 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -337,8 +337,13 @@ MemoryChunk* MemoryChunkIterator::next() {
   return nullptr;
 }
 
-Page* FreeListCategory::page() {
-  return Page::FromAddress(reinterpret_cast<Address>(this));
+Page* FreeListCategory::page() const {
+  return Page::FromAddress(
+      reinterpret_cast<Address>(const_cast<FreeListCategory*>(this)));
+}
+
+Page* FreeList::GetPageForCategoryType(FreeListCategoryType type) {
+  return top(type) ? top(type)->page() : nullptr;
 }
 
 FreeList* FreeListCategory::owner() {