Upstream: Python PGO support

This repository also contains PGO-enabled ebuilds of the Python interpreters. PGO is off by default, but can be enabled by adding pgo to your dev-lang/python USE flags. The initial Python interpreter builds will take much longer to complete, however the interpreters that are built will run much faster than otherwise. This is the default on many binary distributions, including Debian and Arch Linux. The actual PGO training set differs between different Python versions. I rely heavily on the community to test these ebuilds.

Python PGO builds should now be parallelized, which should really help with the build times. The number of parallel jobs is taken from MAKEOPTS in Portage.