merge: move an inspection of the dirstate from record to calculate phase The intent is clearly to have `calculateupdates()` figure out what actions need to be taken and `recordupdates()` to make necessary modifications to the dirstate. However, in the `ACTION_PATH_CONFLICT_RESOLVE` case, there was one little inspection of copy information done in `recordupdates()`. This patch moves that to `calculateupdates()`. That will help with the next patch, which makes `merge.update()` work better with `overlayworkingctx` (copies should be recorded there too, even though we skip the `recordupdates()` step). Differential Revision: https://phab.mercurial-scm.org/D8615