Revert "Apply numeric casts correctly in typed arrays and related code."

This reverts commit r20020 for breaking Win64 build.

TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/199523006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20021 ce2b1a6d-e550-0410-aec6-3dcde31c8c00