[Bug libstdc++/90770] Building with --enable-libstdcxx-debug and make profiledbootstrap fails with mv: cannot stat 'Makefile': No such file or directory

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90770

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think the problem is that the recursive clean targets doesn't remove the
actual 'debug' directory, they just recurse into each sub-directory and remove
the files in the directory. That makes the "if test ! -d ${debugdir}; then"
test wrong.