I see on page 10 that Gassendi holds that Epicurus did *not* hasten his own death / commit suicide. Note that Gassendi is denouncing the Stoics for allowing suicide, and he is praising the religious view that only God should determine the end of our lives.
Gassendi quotes Lactantius saying that Cleanthes, Chrysippus, and Zeno killed themselves "in hopes of being instantly transported to heaven."
looks to me like he is referring to Stoicism when he says "this is a cursed and abominable doctrine which drives men out of their lives."