Simplify the code generator by eliminating the access types STORE and
INIT_CONST and delegating code generation for stores to the appropriate AST
nodes.
Review URL: http://codereview.chromium.org/1889

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@265 ce2b1a6d-e550-0410-aec6-3dcde31c8c00