[Bug libffi/64572] r219477 breaks bootstrap on x86_64 darwin

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572

--- Comment #4 from howarth at bromo dot med.uc.edu ---
The same failures are seen in the libffi test suite at -m32 and -m64. The first
failure appears as...

 ./cls_align_complex_float.exe
48 0.000000,-0.000000i 255 0 0.000000,0.000000i 0: 48 0.000000,-0.000000i 255
res: 0 0.000000,0.000000i 0
0 0.000000,0.000000i 1 12 4951.000000,7.000000i 127: 12 4951.000000,7.000000i
128
Segmentation fault