At the moment the module resolver will end up in an infinite loop in Windows because we are assuming that the root directory is always `/` however in windows this can be any drive letter example `c:/` or `d:/` etc...
With this change we also resolve the drive letter in windows, when using `AbsoluteFsPath.from` for consistence so under `/foo` will be converted to `c:/foo` this is also needed because of relative paths with different drive letters.
PR Close#30297
Alan
Pete Bacon Darwin