Currently both True/False counts were folded. It lost the information,
"It is True or False before folding." It prevented recalling branch
counts in merging template instantiations.
In `llvm-cov`, a folded branch is shown as:
- `[True: n, Folded]`
- `[Folded, False n]`
In the case If `n` is zero, a branch is reported as "uncovered". This is
distinguished from "folded" branch. When folded branches are merged,
`Folded` may be dissolved.
In the coverage map, either `Counter` is `Zero`. Currently both were
`Zero`.
Since "partial fold" has been introduced, either case in `switch` is
omitted as `Folded`.
Each `case:` in `switch` is reported as `[True: n, Folded]`, since
`False` count doesn't show meaningful value.
When `switch` doesn't have `default:`, `switch (Cond)` is reported as
`[Folded, False: n]`, since `True` count was just the sum of `case`(s).
`switch` with `default` can be considered as "the statement that doesn't
have any `False`(s)".
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