Release Notes expansion for BPF

[Hans Wennborg via llvm-commits]

Thanks! r246072. Sorry for the delay.

On Wed, Aug 26, 2015 at 12:06 PM, Alexei Starovoitov
<alexei.starovoitov at gmail.com> wrote:
> Hans,
> could you please apply it?
>
> Thanks!
>
> On Tue, Aug 25, 2015 at 11:13 PM, Brenden Blanco <bblanco at gmail.com> wrote:
>> Hi Hans,
>>
>> Alexei asked me to expand a little bit on the BPF release notes. Here is
>> a bit more info on the 3.7 changes.
>>
>> Sincerely,
>> Brenden