[test] Skip slow test in novfp3 mode.

TBR=yangguo@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1264443002

Cr-Commit-Position: refs/heads/master@{#29894}

test/cctest/cctest.status

@@ -129,6 +129,12 @@
   'test-lockers/LockerUnlocker': [PASS, ['mode == debug', FLAKY]],
 }],  # ALWAYS
 
+##############################################################################
+['novfp3 == True', {
+  # TODO(yangguo): Got very slow after 3069c43.
+  'test-debug/DebugBreakLoop': [SKIP],
+}],  # novfp3 == True
+
 ##############################################################################
 ['arch == arm64', {