tree b34804912de6ebea12b34595fdf5575f771e7437
parent 7917df1e8021023d8d93d811e26becb5e2b8be64
author Andy Heninger <andy.heninger@gmail.com> 1566521316 -0700
committer Andy Heninger <andy.heninger@gmail.com> 1576271841 -0800

ICU-20303 Break Iterator, improve handling of look-ahead rules.

- Merge the look-ahead results slots used when multiple rules share a common accepting state.
- Sequentially number the look-ahead result slot. Will eventually allow replacing the runtime map with an array.
- Inhibit chaining out of look-ahead rules. This could never actually happen; when a hard break
  rule matches, the engine is stopped immediately, but the state table was being constructed
  as if it could  happen. Reduces table size for line break rules.
- Remove incorrect handling of fAccepting and fLookAhead fields of a state table row
  when removing duplicate states. Look-ahead slot number was being mis-interpreted as a state number.