In comments to bug 1068661 was proposed workaround which works for me. Here is 
what I've done:
1. Switch back to open-source driver.
2. Issued
$ sudo apt-get install linux-header-generic
command
3. Switched to AMD proprietary driver (fglrx-updates)
4. Rebooted.

After reboot Unity works as expected, and application which uses OpenCL
correctly displays both CPU and GPU devices.

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https://bugs.launchpad.net/bugs/1069668

Title:
  1002:6758 Unity does not work with proprietary AMD video drivers
  Radeon HD 6670

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