Disable iterator debugging in coverage build.
Disable iterator debugging in coverage build.

R=chrisha@chromium.org

Review URL: https://codereview.appspot.com/6742070

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1175 15e8cca8-e42c-11de-a347-f34a4f72eb7d

sebmarchand/syzygy,google/syzygy,wangming28/syzygy,ericmckean/syzygy,ericmckean/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,google/syzygy,Eloston/syzygy,supriyantomaftuh/syzygy,pombreda/syzygy,pombreda/syzygy,wangming28/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,ericmckean/syzygy,wangming28/syzygy,pombreda/syzygy,wangming28/syzygy,pombreda/syzygy,google/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,google/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,Eloston/syzygy,sebmarchand/syzygy,ericmckean/syzygy