Support for object literals in fast compiler.

Support for object literals in fast compiler.

I also added more unit tests for literals.

Right now, the fast compiler produces code very similar to
the existing code generator. We may consider different ways to
further compact the generated code for top-level code.

ARM always goes through a runtime function to initialize computed
properties in an object literal whereas IA32 and x64 use StoreIC.

Review URL: http://codereview.chromium.org/316009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3129 ce2b1a6d-e550-0410-aec6-3dcde31c8c00