MIPS: Remove KeyedStoreIC::GenerateRuntimeSetProperty and move Store::GenerateRuntimeSetProperty to the PropertyICCompiler.

Port r23311 (654ca86)

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/504743002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23343 ce2b1a6d-e550-0410-aec6-3dcde31c8c00