MariaDB Server is unnecessarily evaluating the arguments of
DBUG_PRINT() macros when the label is not defined.

The macro DBUG_LOG() for C++ operator<< output which was added for
InnoDB diagnostics in MySQL 5.7 is missing from MariaDB. Unlike the
MySQL 5.7 implementation, MariaDB will avoid allocating and
initializing the output string when the label is not defined.

Introduce DBUG_OUT("crypt") and DBUG_OUT("checksum") for some InnoDB
diagnostics, replacing some use of ib::info().