stop using AsciiValue

TBR=svenpanne@chomium.org
BUG=

Review URL: https://codereview.chromium.org/15129002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14645 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Enable native implementation of array buffer and typed arrays in d8 and tests.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/15059009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14646 ce2b1a6d-e550-0410-aec6-3dcde31c8c00