Sync TTM: Process input tokens via workstack in transformTokens.

* Apply cleanup from 555ec42b to SyncTTM as well (which I didn't
  think of checking).
  - workStack is initialized to input tokens.
  - Track elt-index on the stack array.
  - Simplifies code by not having two separate paths for
	fetching tokens.

* Some minor unrelated cleanup in AsyncTTM:transformTokens loop
  - no semantic changes.

* No change in parser test results.
* Verified errorless RT-ing of en:Barack Obama.

* Should be the last of the cleanup commits before moving to
  bug fixes in transformTokens loop.

Change-Id: I7efcfb6f9468f16cbb4b37d55cd5596cf9da0c16