Bug 940069 - Land a temporary debugging printf that runs on --enable-valgrind builds only, because Valgrind runs aren't available on tryserver.  r=me.
Backed out changeset 21df28ade757 (bug 939608) for fixing PGO Build Failures
Backed out changeset 161bfee3f57a (bug 939608) for fixing PGO Build Bustage