[Bug fortran/43136] Excess copy-in/copy-out with character argument

[tkoenig at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43136

--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> 2011-01-08 
22:18:31 UTC ---
We have to watch out for aliasing here; if
foo changes the arguments, we have to have a copy.

Compare PR 47065.