profiler: declare missing `printErr`

`v8/tools/tickprocessor.js` assumes presence of global `printErr`, which
is defined in `d8`.

PR-URL: https://github.com/nodejs/node/pull/13590


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>