I installed CC7 alongside CS6.
CC7's gpusniffer.exe recognized my Radeon 6630M (switchable) with 1GB dedicated and launched with OpenCL support without a hitch. Incidentally, %errorlevel% still returned a 14.
I tried copying gpusniffer.exe and its 29 DLL dependencies over to CS6, just in case it would launch, but no dice.
3 side notes:
-the opencl file in CC7 now lists a bunch of code names for the ATI cards and mine, "Turks" was listed therein. "Turks" does not appear in the CS6 file.
-gpusniffer.exe exists in the After Effects directory, but the output is different.
-OpenCL support in Photoshop CS6 was greyed out before installing CC7, then was available and stayed available after removing CC7.