Merge pull request #16608 from vpisarev:fix_mac_ocl_tests

* fixed several problems when running tests on Mac:
* OCL_pyrUp
* OCL_flip
* some basic UMat tests
* histogram badarg test (out of range access)

* retained the storepix fix in ocl_flip only for 16U/16S datatype, where the OpenCL compiler on Mac generates incorrect code

* moved deletion of ACCESS_FAST flag to non-SVM branch (where SVM is shared virtual memory (in OpenCL 2.x), not support vector machine)

* force OpenCL to use read/write for GPU<=>CPU memory transfers on machines with discrete video only on Macs. On Windows/Linux the drivers are seemingly smart enough to implement map/unmap properly (and maybe more efficiently than explicit read/write)

modules/imgproc/test/test_histograms.cpp

@@ -1966,7 +1966,7 @@ TEST(Imgproc_Hist_Calc, badarg)
     Mat img = cv::Mat::zeros(10, 10, CV_8UC1);
     Mat imgInt = cv::Mat::zeros(10, 10, CV_32SC1);
     Mat hist;
-    const int hist_size[] = { 100 };
+    const int hist_size[] = { 100, 100 };
     // base run
     EXPECT_NO_THROW(cv::calcHist(&img, 1, channels, noArray(), hist, 1, hist_size, ranges, true));
     // bad parameters