Use auto-predication in drmemtrace

Created by: toshipiazza

#2583 adds auto predication globally, and adds rudimentary support for it for all sample clients. drmemtrace requires more work however. Currently drmemtrace opts out completely from auto predication, as it uses its own mechanism to predicate meta-instructions where necessary.

This issue involves adding support for auto predication to drmemtrace specifically, replacing the current techniques used to handle predicated app instructions.