[OE-core] [PATCH] python3: enable profile optimized builds

[richard.purdie at linuxfoundation.org]

On Thu, 2018-08-23 at 12:40 -0400, Derek Straka wrote:
> +1 for this being opt in.  It's a substantial hit to build time
> 
> On Thu, Aug 23, 2018 at 12:21 PM Christopher Larson <kergoth at gmail.co
> m> wrote:
> > IMO PGO should really stay opt-in, not opt-out, given the
> > performance impact.

I'm not arguing against that however I'd note that the performance of
the resulting python binary is substantially different too, much more
that you'd think.

For older distros where we use buildtools tarball on the builders, pgo
python binaries should help significantly with things like bitbake
parsing speed (I'd love to see numbers).

Cheers,

Richard