Changes or additions to x86 code that should be ported to Allen

Cleanup of obsolete code for Run 3

Automatic throughput test shows increase in HLT1 throughput

Automatic throughput test shows increase in HLT2 throughput

Automatic throughput test shows decrease in HLT1 throughput

Automatic throughput test shows decrease in HLT2 throughput

A merge request with this label is picked up in the lhcb-head-2 nightly slot.

A merge request with this label is picked up in the lhcb-run2-patches nightly slot.

A merge request with this label is picked up in the lhcb-run2-patches-dev4 nightly slot.

A merge request with this label is picked up in the lhcb-new-cmake nightly slot.

Merge request on legacy branches

A merge request with this label is picked up in all nightly builds building the target branch.

A merge request with this label is picked up in the lhcb-lcg-dev3 nightly slot.

A merge request with this label is picked up in the lhcb-lcg-dev4 nightly slot.

A merge request with this label is picked up in the lhcb-lcg-test nightly slot.

A MR with this label is blocked by another that goes together with it but is still WIP

Jet reconstruction