[PATCH] D17505: Exit early

[Rafael Espíndola via llvm-commits]

> I wrote it mostly for sanity when benchmarking other ideas of how to
> write the data out. For example, I want to properly benchmark using
> anonymous memory + write and play with async write, but want to make
> sure to not include extra shutdown costs.
>
> I will benchmark it on OS X (laptop) and windows (VM).

On OS X there is no perf, so I had to write a small python script to
time it (attached).

clang: 1.016X faster.

scylla: 1.004X faster.

Cheers,
Rafael
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