This is a variant of IvyBridge with indirect branch prediction
protection. The only difference between IvyBridge and IvyBridge-IBRS is
the added "spec-ctrl" feature.

The IvyBridge-IBRS model in QEMU is a bit different since IvyBridge got
several additional features since we added it in cpu_map.xml:
    arat, vme, xsaveopt

Adding them only to the -IBRS variant would confuse our CPU detection
code.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>