Add avx512 core instructions check 2 (#27750)

* Add test skip from cmake

* Remove print

python/paddle/fluid/tests/unittests/mkldnn/test_conv2d_bf16_mkldnn_op.py

@@ -35,6 +35,8 @@ def conv2d_residual_naive(out, residual):
     return out
 
 
+@unittest.skipIf(not core.supports_bfloat16(),
+                 "place does not support BF16 evaluation")
 class TestConv2dBf16Op(TestConv2dOp):
     def setUp(self):
         self.op_type = "conv2d"
@@ -42,9 +44,9 @@ class TestConv2dBf16Op(TestConv2dOp):
         self.exhaustive_search = False
         self.use_cuda = False
         self.use_mkldnn = True
+        self._cpu_only = True
         self.weight_type = np.float32
         self.input_type = np.float32
-        self.use_mkldnn = True
         self.mkldnn_data_type = "bfloat16"
         self.force_fp32_output = False
         self.init_group()
@@ -205,5 +207,4 @@ class TestWithInput1x1Filter1x1(TestConv2dBf16Op):
 
 
 if __name__ == '__main__':
-    if core.supports_bfloat16():
-        unittest.main()
+    unittest.main()