On standalone dartium which has about 50000 tokens in the libraries (core, coreimpl, builtin, io etc.) this reduces the heap size by about 180kb. The size of the standalone snapshot buffer reduces by about 72kb.
Also moved the keyword symbol table to the object store so that it does not have to repopulated on every script compilation. Should benefit regular user script load times.
Review URL: https://chromiumcodereview.appspot.com//9462003
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4734 260f80e4-7a28-3924-810f-c04153c831b5
zerny@google.com