Mostly mechanics here. Interesting decisions:
- apply disambiguation in-place instead of copying the forest
debatable, but even the final tree size is significant
- split decide/apply into different functions - this allows the hard part
(decide) to be tested non-destructively and combined with HTML forest easily
- add non-const accessors to forest to enable apply
- unit tests but no lit tests: my plan is to test actual C++ disambiguation
heuristics with lit, generic disambiguation mechanics without the C++ grammar
Differential Revision: https://reviews.llvm.org/D132487
Sam McCall