Implement ftruncate abi

src/graphics/host_gpu/renderer/cache/multiLevelPageTable.h

@@ -105,7 +105,8 @@ private:
 };
 
 // Inline owner storage for page-table entries. Texture pages normally have only a
-// handful of owners, so avoid a heap allocation on the first 16 registrations.
+// handful of owners, so avoid a heap allocation on the first 16 registrations as
+// shadPS4 does with boost::container::small_vector<ImageId, 16>.
 //
 // Owners are packed into live uint64_t objects instead of being constructed in
 // raw storage. This keeps sparse bucket construction cheap without relying on