[Bug go/64005] make check FAIL: sync

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64005

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Ian explained in an offline communication:

It's more likely that with -O2 some dead pointers appears in a stack
frame, and cause the garbage collector to think that the values are
still live, and therefore they are not collected, and therefore they
are not finalized.  The gccgo garbage collector is not precise.  Which
pointers are left live in a stack frame varies a lot depending on
processor and optimization level.