* Move blockhash and fee_calculator in ThisInvokeContext instead of using a reference.
* Moves tx_wide_compute_cap into InvokeContext::push().
* Adds ThisInvokeContext::new_mock() constructor.
* Adds missing loader account in uses of MockInvokeContext.
* Use keyed_account_at_index() when accessing keyed_accounts.
* Makes sysvar interface consistent between ThisInvokeContext and MockInvokeContext,
in order to add InvokeContext::get_sysvars().
* Adds InvokeContext::set_blockhash() and InvokeContext ::set_fee_calculator().
* Adds new_mock_with_features.
* Makes ancestors optional in ThisInvokeContext.
* Adds prepare_mock_invoke_context() and mock_process_instruction().
* 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
The program_id is not needed on "Program return data: " because it
always preceeded by the program invoke message, so no need to repeat
the program id. Also rename this to "Program return: " since "data"
is redundant.
* 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.
* Return error if Transaction locks an executable as writable
* Return error if a ProgramData account is writable but the upgradable loader isn't present
* Remove unreachable clause
* Fixup bpf tests
* Review comments
* Add new TransactionError
* Disallow writes to any upgradeable-loader account when loader not present; remove is_upgradeable_loader_present exception for all other executables
* Move transaction sanitization earlier in the pipeline
* Renamed HashedTransaction to SanitizedTransaction
* Implement deref for sanitized transaction
* bring back process_transactions test method
* Use sanitized transactions for cost model calculation
* Moves syscall_registry into the rbpf Executable constructor.
* Adds the reject_unresolved_syscalls flag which is only set when deploying programs via the CLI.
rustc default compiler optimization level is O3. This change removes
the option that overrides the default optimization level, because it
is safe to do so. The code generation is incorrect in some cases
because of link-time optimizations, which remain disabled for
compiling BPF programs. In addition, this commit updates the expected
instruction counts for assert_instruction_count test.