* Removes search for accounts and unsafe lifetime transmute in InvokeContext::push().
* Replaces accounts by account_indices in verify_and_update() and process_cross_program_instruction().
Co-authored-by: Justin Starry <justin.m.starry@gmail.com>
* Removes two account copy steps from InstructionProcessor::native_invoke().
* Moves gathering of keyed_accounts, caller_write_privileges and program_indices into InstructionProcessor::create_message().
* Explicitly routes the serialized account lengths to enable sharing of existing account structures.
* Recycles existing account structs in CPI syscall.
* Appends loaders / executable_accounts to accounts in transaction loading.
* Adds indices to loaders / executable_accounts.
* Moves MessageProcessor::create_keyed_accounts() into InvokeContext::push().
* Removes "executable_accounts",
now referenced by transaction wide index into "accounts".
* Removes create_pre_accounts() from InstructionProcessor,
as it is already in MessageProcessor.
* Collect program account indices directly in load_executable_accounts().
