Remove access to LivenessAnalysis states when not needed.
Remove access to LivenessAnalysis states when not needed.

R=chrisha@chromium.org, rogerm@chromium.org
BUG=

Review URL: https://codereview.appspot.com/9832043

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1547 15e8cca8-e42c-11de-a347-f34a4f72eb7d

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