Remove arch specific api callback generate functions

R=verwaest@chromium.org

BUG=

Review URL: https://codereview.chromium.org/169353002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19406 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix heap snapshot crash when JSArrayBuffer has no backing_store.

LOG=N
BUG=344239
R=dslomov@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/169393004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00