Merge branch 'av/fsmonitor'

Various fixes to bp/fsmonitor topic. * av/fsmonitor: fsmonitor: simplify determining the git worktree under Windows fsmonitor: store fsmonitor bitmap before splitting index fsmonitor: read from getcwd(), not the PWD environment variable fsmonitor: delay updating state until after split index is merged fsmonitor: document GIT_TRACE_FSMONITOR fsmonitor: don't bother pretty-printing JSON from watchman fsmonitor: set the PWD to the top of the working tree