Remove tryObjectEncoding() calls from list type.
Remove tryObjectEncoding() calls from list type.

All lists are now represented via quicklists.
Quicklists are never represented referencing robj structures, so trying
to compress their representation does not make sense. That the new way
is faster was experimentally verified with micro benchmarks in order to
prove that the intuition was correct.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis