Less bad copy throughout libsyntax/librustc #5443
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Removes a lot of instances of
/*bad*/ copy
throughout libsyntax/librustc. On the plus side, this shaves about 2s off of the runtime when compilinglibrustc
with optimizations.Ideally I would have run a profiler to figure out which copies are the most critical to remove, but in reality there was a liberal amount of
git grep
s along with some spot checking and removing the easy ones.