Skip tests for mips.

TBR=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/698513003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25035 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Upgrade test262-es6

TBR=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/695763003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00