The additional tools are only available in CC 2015. See here: http://blogs.adobe.com/lightroomjournal/2015/06/june-updates-to-cc-photography.html
If you'd like to discuss this topic, there are various other threads in this forum about this.
Dehaze is not a feature of the perpetual license version of LR6, only of the subscription version.
What you can do is:
a. Wait for the release of LR7 in around a year and a half, since it is likely that Dehaze will be included.
b. Subscribe to the PS + LR rental package or the full Adobe CC package. Neither of these are likely to be attractive to you if you have already paid for a perpetual license.
As everyone else has said it isn't DIRECTLY available in the LR6 perpetual licence version.
You can invoke it however.
I've already created presets for -100 to +100 and installed them in LR6, they work. For now.....
The presets are available on request, PM me for details.