Prevent having to search twice when adding handle to slow handle set
Prevent having to search twice when adding handle to slow handle set

This uses the return value of the insert to determine if the value was
already in the set or not, so we only reference it if it was newly
added.

jemc/rubinius,mlarraz/rubinius,sferik/rubinius,Wirachmat/rubinius,ngpestelos/rubinius,benlovell/rubinius,Azizou/rubinius,jsyeo/rubinius,dblock/rubinius,ngpestelos/rubinius,Azizou/rubinius,kachick/rubinius,digitalextremist/rubinius,jemc/rubinius,dblock/rubinius,pH14/rubinius,Azizou/rubinius,jsyeo/rubinius,dblock/rubinius,benlovell/rubinius,mlarraz/rubinius,kachick/rubinius,Wirachmat/rubinius,sferik/rubinius,Wirachmat/rubinius,heftig/rubinius,jemc/rubinius,heftig/rubinius,jsyeo/rubinius,dblock/rubinius,mlarraz/rubinius,kachick/rubinius,kachick/rubinius,Azizou/rubinius,benlovell/rubinius,jemc/rubinius,digitalextremist/rubinius,jsyeo/rubinius,jemc/rubinius,sferik/rubinius,pH14/rubinius,sferik/rubinius,heftig/rubinius,digitalextremist/rubinius,jemc/rubinius,mlarraz/rubinius,mlarraz/rubinius,Wirachmat/rubinius,digitalextremist/rubinius,Azizou/rubinius,heftig/rubinius,pH14/rubinius,benlovell/rubinius,digitalextremist/rubinius,jsyeo/rubinius,pH14/rubinius,dblock/rubinius,Wirachmat/rubinius,ngpestelos/rubinius,ngpestelos/rubinius,kachick/rubinius,sferik/rubinius,jsyeo/rubinius,ruipserra/rubinius,dblock/rubinius,kachick/rubinius,ngpestelos/rubinius,Wirachmat/rubinius,digitalextremist/rubinius,Azizou/rubinius,sferik/rubinius,kachick/rubinius,jsyeo/rubinius,pH14/rubinius,benlovell/rubinius,pH14/rubinius,mlarraz/rubinius,heftig/rubinius,Wirachmat/rubinius,ruipserra/rubinius,benlovell/rubinius,sferik/rubinius,jemc/rubinius,ruipserra/rubinius,benlovell/rubinius,dblock/rubinius,pH14/rubinius,heftig/rubinius,digitalextremist/rubinius,ruipserra/rubinius,ruipserra/rubinius,kachick/rubinius,mlarraz/rubinius,ngpestelos/rubinius,ruipserra/rubinius,ngpestelos/rubinius,heftig/rubinius,ruipserra/rubinius,Azizou/rubinius