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i#2907 early itimer: delay itimer until handlers are in place

Merged Derek Bruening requested to merge i2907-early-itimer into master

Addresses one init-time itimer race still in place: the initial thread's itimer is set up prior to putting the signal handlers in place. We delay that here to eliminate the problematic time window.

Tested on a third-party app which crashed with SIGVTALRM 8x out of 3000 before this fix and 0x after.

Issue: #2907 (closed)