[Bug target/60337] s390: Function arguments are not aligned

[vogt at linux dot vnet.ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60337

--- Comment #5 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
With -O2 and -O3 all three cases generate the proper alignment
With -O1 only foo() has the proper alignment
With -O0 none of the cases has the proper alignment

==> Code compiled with -O0 and -O3 accidentally uses a different ABI.

Power shows the same erratic behaviour, on amd64 alignment works with all
-O{0,1,2,3}.