* Inlines MessageProcessor::execute_instruction() in MessageProcessor::process_message().
* Moves MessageProcessor::create_pre_accounts() into ThisInvokeContext::push().
* Move instruction_recorders slice into InvokeContext.
* Makes account_indices optional in InvokeContext::push().
* Separates initial InvokeContext::push() from ThisInvokeContext::new().
* invoke_context.pop() the base invocation frame.
* Zip message.instructions.iter() and program_indices.iter().
* Moves ThisInvokeContext::new() to the beginning of the loop inside MessageProcessor::process_message().
* Hoists ThisInvokeContext::new() out of loop inside MessageProcessor::process_message().
* Removes unnecessary clone() from ThisInvokeContext::new() in MessageProcessor ::process_message().
* Stop ignoring errors from MessageProcessor::create_pre_accounts().
* Moves MessageProcessor::verify_account_references() and MessageProcessor::verify() into InvokeContext::verify().
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