Eliminate the need of ::testsing::ValuesIn() for CV_ENUM

Also cv::, cv::gpu:: and cv::ocl:: namespace prefixes can be safely omitted
inside CV_ENUM and CV_FLAGS

modules/core/perf/perf_compare.cpp

@@ -15,7 +15,7 @@ PERF_TEST_P( Size_MatType_CmpType, compare,
              testing::Combine(
                  testing::Values(::perf::szVGA, ::perf::sz1080p),
                  testing::Values(CV_8UC1, CV_8UC4, CV_8SC1, CV_16UC1, CV_16SC1, CV_32SC1, CV_32FC1),
-                 testing::ValuesIn(CmpType::all())
+                 CmpType::all()
                  )
              )
 {
@@ -38,7 +38,7 @@ PERF_TEST_P( Size_MatType_CmpType, compareScalar,
              testing::Combine(
                  testing::Values(TYPICAL_MAT_SIZES),
                  testing::Values(TYPICAL_MAT_TYPES),
-                 testing::ValuesIn(CmpType::all())
+                 CmpType::all()
                  )
              )
 {