The solana-program crate can be used in certain embedded environments (HSMs) where
the source of entropy, whether used for cryptographic purposes or not, is tightly
controlled. In these cases, using the default OS source of entrophy is not always
acceptable. Thus, using the default Rust stdlib entropy source for seeding its
default hasher, is prohibited. This means any use of HashMap/HashSet must be able
to be constructed and used with a custom hasher implementation.
This commit removes the use of Itertools::unique() to dedupe Instructions that are
being compiled into a new Message, which uses a default-configured HashMap
under-the-hood. Instead, we use a BTreeSet which does not invoke any entropy
source in order to seed a hash implementation.
* Make helper associated fn
* Add feature definition
* Add handling to preserve program-id write lock when upgradeable loader is present; restore bpf upgrade-self test
* Use single feature
* Version transaction message and add new message format
* Update abi digest due to message path change
* Update v0.rs
Fix comment
* Update original.rs
* Update message versions name and address map indexes field name
* s/original/legacy
* update comment
* cargo fmt
* Update abi digest due to legacy rename
