Change ArrayBuffer API and implementation to use embedder-provided allocator.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/15855012

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15056 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Increase sanity of integer division handling on ARM

- In the INT32 BinaryOpStub, fix type feedback collection for DIV,
  bringing it in line with other platforms.
- In Lithium codegen, emit proper inlined code, don't call the stub.
- Drive-by fix: assert appropriate CpuFeaturesScope for SDIV.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/16082008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15057 ce2b1a6d-e550-0410-aec6-3dcde31c8c00