Revert "[MemProf] Defer profile file setup until dump time"

This reverts commit ea1826ee57984d4f44fdb4b35a47169d393618ed.

This change is breaking the ability of tests to override the profile
output file. Need to add a mechanism to do that before resubmitting.

GitOrigin-RevId: 311801a0179be9dc86895e08e3bba66cea2c0724
4 files changed