r228592 - Add the hostname to the module hash to avoid sharing between hosts

[Chandler Carruth]

Nits:

On Mon, Feb 9, 2015 at 11:23 AM, Ben Langmuir <blangmuir at apple.com> wrote:

> +  char hostname[256];
> +  hostname[255] = 0;
> +  hostname[0] = 0;
> +  gethostname(hostname, 255);
>

It would be good to document that we want to actively ignore any error here.

Also, pedantically you should set [255] to 0 here rather than above. POSIX
doesn't require null termination in the event it is truncated.

+  code = hash_combine(code, StringRef(hostname));
> +#endif
>
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