fixed extrapolation for ocl::cornerMinEigenVal and ocl::cornerHarris; enabled CV_32FC1 for the first function

Also, added the missing include guard to perf_precomp.hpp.
This should fix the build.

change the download channels to oclchannles()
fix bugs of arithm functions
perf fix of bilateral
bug fix of split test case
add build_warps functions

fix the channel 3 bug in matrix operation
perf and buf fix for LUT haardetect convertC3C4 resize warpaffine copytom settom
add convovle
remove stereo