RFR: JDK-8193717: Import resolution performance regression in JDK 9

[Liam Miller-Cushon]

Hi Jan,


> Liam, could you please check if this helps with your real-world case?
>

The numbers for the original compilation look great:
before: avg 299.9s, stddev 56.5s
after:  avg 155.1s, stddev 24.8s

That compilation is large and is less pathological than the repro in the
bug (it's not just doing import resolution), so it's not surprising that it
still takes some time.

Thanks,
Liam
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