Remove the first_right_arg hack for HMod.

Generate a proper subgraph in BuildBinaryOperation instead.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/77053003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17919 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Activate Hydrogen-generated KeyedLoadDictionary ICs

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/59813011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17921 ce2b1a6d-e550-0410-aec6-3dcde31c8c00