Mark test-cpu-profiler/SampleWhenFrameIsNotSetup as flaky on MIPS simulator

test/cctest/cctest.status

Index: test/cctest/cctest.status
diff --git a/test/cctest/cctest.status b/test/cctest/cctest.status
index 84a1a7095502a1c54cd1efca0aee60bdfb5f92cf..595293bd8d3d6a90770b24201368a084d6c33310 100644
--- a/test/cctest/cctest.status
+++ b/test/cctest/cctest.status
@@ -70,6 +70,12 @@ test-serialize/DeserializeAndRunScript2: SKIP
 test-serialize/DeserializeFromSecondSerialization: SKIP
 
 ##############################################################################
+[ $arch == mipsel ]
+
+# BUG(2628): The test sometimes fails on MIPS simulator.
+test-cpu-profiler/SampleWhenFrameIsNotSetup: PASS || FAIL
+
+##############################################################################
 [ $arch == android_arm || $arch == android_ia32 ]
 
 # Tests crash as there is no /tmp directory in Android.