[Bug driver/89014] Use-after-free in aarch64 -march=native

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89014

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Reproducer:
  $ valgrind ./xgcc -B. -c test.c -march=native -v
(with a dummy test.c; see with today's trunk e.g. r268186)