Rollup merge of #38664 - apasel422:may-dangle, r=pnkfelix

Replace uses of `#[unsafe_destructor_blind_to_params]` with `#[may_dangle]`

CC #34761

r? @pnkfelix

diff --cc src/liballoc/arc.rs
Simple merge

diff --cc src/liballoc/lib.rs
Simple merge

diff --cc src/libarena/lib.rs
Simple merge

diff --cc src/libcollections/lib.rs
Simple merge

diff --cc src/libcollections/vec.rs
Simple merge

diff --cc src/libcollections/vec_deque.rs
Simple merge

diff --cc src/libstd/lib.rs
Simple merge