Fix passing -O1 to build from cargo test
#738
Merged
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In 9e03087 we started setting
opt-level
only on profile.test and not profile.dev. When thatcommit was authored I tested only that rustc was being called with
opt-level set in its flags, not that the resulted run ran at the
speed I expected. It seems profile.test isn't applied properly to
dependencies or so, resulting in tests running much slower than
they do at profile.dev.opt-level=1.