[gn] Enable stricter build flags

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 167e5fb70facf7e786b49cf1db01fbb30f7793c4..2cbc835d5e4e863e92abbb98050bac9170e4f2f5 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -212,7 +212,7 @@ Page* Page::ConvertNewToOld(Page* old_page) {
   DCHECK(old_page->InNewSpace());
   OldSpace* old_space = old_page->heap()->old_space();
   old_page->set_owner(old_space);
-  old_page->SetFlags(0, ~0);
+  old_page->SetFlags(0, static_cast<uintptr_t>(~0));
   old_space->AccountCommitted(old_page->size());
   Page* new_page = Page::Initialize<kDoNotFreeMemory>(
       old_page->heap(), old_page, NOT_EXECUTABLE, old_space);