ignore release as well

This GM is flaky as Brian expected on both Release and Debug,
so suppress the Release expectation as well.

NOTREECHECKS=true
NOTRY=true
R=bsalomon@google.com
TBR=bsalomon
BUG=skia:2826

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/489083002
diff --git a/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86-Release/expected-results.json b/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86-Release/expected-results.json
index ef32477..7eb2696 100644
--- a/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86-Release/expected-results.json
+++ b/expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86-Release/expected-results.json
@@ -6986,6 +6986,10 @@
           215278920234240161
         ]
       ], 
+      "bugs": [
+        2826
+      ],
+      "ignore-failure": true,
       "reviewed-by-human": true
     }, 
     "degeneratesegments_pdf-poppler.png": {