Re: gcc vs clang for non-power-2 atomic structures

[Jim Wilson]

I was pointed at
    https://bugs.llvm.org/show_bug.cgi?id=26462
for the LLVM discussion of this problem.

Another issue here is that we should have ABI testing for atomic.
For instance, gcc/testsuite/gcc.dg/compat has no atomic testcases.
Likewise g++.dg/compat.

Jim