TAPI: fix OpenCL warpers and test
Fixed compilation error due to missing std::.
TAPI: fix perf test for warpers
some fixes in perf tests
Merge pull request #2325 from alalek:perf_fix
Merge pull request #2376 from GrinIara:master
Fixed typo with indexes in getGradient(x/y) functions.
ported 2.4 perf tests for matchTemplate
Merge pull request #2383 from ilya-lavrenov:perf_match_template
Merge pull request #2377 from alalek:tapi_warpers_perf_test
Merge pull request #2375 from akarsakov:fix_getGradient