only test on machines that claim it should work in the first
place.
In this case, and with this feature specifically, it isn't portable and
reliable enough.
> gcc/testsuite:
> * gcc.dg/Wno-frame-address.c: Skip for cris and mmix.
>
> --- gcc/gcc/testsuite/gcc.dg/Wno-frame-address.c.ori
Long-standing FAIL remedied; committed. Maybe better to list
the targets that *do* support arbitrary frame access?
gcc/testsuite:
* gcc.dg/Wno-frame-address.c: Skip for cris and mmix.
--- gcc/gcc/testsuite/gcc.dg/Wno-frame-address.c.orig Mon Jan 13 22:30:47 2020
+++ gcc/gcc/testsuite
