Using murmurhash2 instead of fnv

[Rui Ueyama via llvm-commits]

This is very interesting. I'm fine with this change, but I'm wondering if
you want to add that function to LLVM rather than LLD.

On Fri, Sep 9, 2016 at 7:03 AM, Rafael Espíndola <rafael.espindola at gmail.com
> wrote:

> One annoying property of fnv is that it does one multiplication per
> byte. Murmurhash2 does 3 per every 8 bytes.
>
> With the attached hack linking libxul.so goes from 7.496263743s to
> 6.661119354.
>
> If there is no objections I will write a proper patch for it.
>
> Cheers,
> Rafael
>
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