Pass dependency to HLoadNamedField for array length load

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/267773004

Patch from Jing Bao <jing.bao@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21162 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Move generated math methods from platform to codegen

BUG=none
R=mstarzinger@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/269823006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21163 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'