Rollup of 4 pull requests#99399

Closed

Dylan-DPC wants to merge 9 commits intorust-lang:masterfrom

Dylan-DPC:rollup-wz1uv22

Commits on Jul 3, 2022

Add size assert in transmute_copy
5225225
committed

Commits on Jul 8, 2022

Use FxIndexMap instead of otherwise unused StableMap for WEAK_ITEMS_REFS.
michaelwoerister
committed
Remove unused StableMap and StableSet types from rustc_data_structures
michaelwoerister
committed

Commits on Jul 14, 2022

add missing null ptr check in alloc example
RalfJung
committed