tests: Add im2col perf tests

Author: jeffbolznv

tests/test-backend-ops.cpp

@@ -3945,6 +3945,18 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_perf() {
         }
     }
 
+    for (int K : {3, 5}) {
+        for (int IC : {256, 2560}) {
+            for (int IW_IH : {32, 64, 256}) {
+                if (IC == 2560 && IW_IH == 256) {
+                    // too big
+                    continue;
+                }
+                test_cases.emplace_back(new test_im2col(GGML_TYPE_F32, GGML_TYPE_F16, GGML_TYPE_F32, {IW_IH, IW_IH, IC, 1}, {K, K, IC, 1}, 1, 1, 1, 1, 1, 1, true));
+            }
+        }
+    }
+
     return test_cases;
 }