MIPS: Add support to load/store byte fields.

Port r17079 (0885ac2)

Original commit message:
This adds a new Byte representation and support for zero-extended
loads in HLoadNamedField and truncated stores in HStoreNamedField.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/25460003

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17085 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Rename ComputeLoadStoreField to just handle ComputeStoreField.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25683005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17086 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Cleanup map deprecation handling in the ICs

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25529002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17087 ce2b1a6d-e550-0410-aec6-3dcde31c8c00