[NFC] Ability to add flags to peano's opt without recompiling iree #938
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Motivation: we probably want -O3, but not completely commited yet (see #929)
I've added a c++ unit test, I've also tested this from run.py with
and it works, but I don't want this e2e style test to CI for now.
Also in PR:
-- use anonymous namespace for functions to in .h file
-- absorb #937 (will rebase this on that if that's reviewed first)