[Bug boehm-gc/66848] boehm-gc fails test suite on x86_64-apple-darwin15

[howarth.at.gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66848

--- Comment #22 from Jack Howarth <howarth.at.gcc at gmail dot com> ---
(In reply to Dominique d'Humieres from comment #21)
> 
> for both -m32 and -m64. Are they related?

Yes. If you apply the ugly hack from comment 11, you will find that it fixes
both the boehm-gc test suite regressions as well as those in the libjava test
suite (which are due to the breakage in boehm-gc used by libjava).