Make std.file.DirEntry._ensureStatDone safe
Mark std.uni.spaceFor as safe and nogc
Merge pull request #2601 from tom-tan/safe-file-DirEntry-_ensureStatDone

Make std.file.DirEntry._ensureStatDone safe
Merge pull request #2623 from tom-tan/safe-nogc-uni-spaceFor

Mark std.uni.spaceFor as safe and nogc