MIPS: Hydrogenize (and share) StoreField except heapobject (for now).

Port r22909 (df25caa5)

BUG=
R=gergely.kis@imgtec.com

Review URL: https://codereview.chromium.org/447673003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22930 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Always use the StoreFieldStub to do the actual storing.

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/443963002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22931 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Check for initialized code stub descriptor in the deoptimizer.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/448683002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00