Delete dead code from HOptimizedGraphBuilder::VisitCompareOperation

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/26419005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17214 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Do not look up ArrayBuffer on global object in typed array constructor.

BUG=v8:2931
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/27238009

Patch from Ben Noordhuis <info@bnoordhuis.nl>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17215 ce2b1a6d-e550-0410-aec6-3dcde31c8c00