llscan: use map::emplace instead of map::insert
llscan: use map::emplace instead of map::insert

PR-URL: https://github.com/nodejs/llnode/pull/46
Reviewed-By: yjhjstz <36962fde063271aaed09f23a12a7333cf68657c8@163.com>
Reviewed-By: Howard Hellyer <318e722a2f3c0517a913efd57bb582023357e5e6@uk.ibm.com>

hhellyer/llnode,hhellyer/llnode,rnchamberlain/llnode,hhellyer/llnode,rnchamberlain/llnode,rnchamberlain/llnode,rnchamberlain/llnode,hhellyer/llnode