Ignore degeneratesegments for nvprmsaa4 to unbreak the build

Ignore degeneratesegments for nvprmsaa4 to unbreak the build. The result image
seems to be inconsistent with different Linux GTX660 builds. Ignore the test for
Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release.

BUG=skia:2689
R=rmistry@google.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/345423006
diff --git a/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/expected-results.json b/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/expected-results.json
index 1190391..86b5537 100644
--- a/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/expected-results.json
+++ b/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/expected-results.json
@@ -7074,6 +7074,10 @@
           13762763215526500776
         ]
       ], 
+      "ignore-failure": true,
+      "bugs": [
+        2689
+      ],
       "reviewed-by-human": true
     }, 
     "degeneratesegments_pdf-poppler.png": {