[Bug target/53383] Allow -mpreferred-stack-boundary=3 on x86-64

[hpa at zytor dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383

--- Comment #2 from H. Peter Anvin <hpa at zytor dot com> 2012-05-17 14:11:23 UTC ---
Why would -mcmodel=kernel matter for this?  (For the record, there is C code in
the Linux kernel which doesn't use -mcmodel=kernel, too, and other embedded
programs may very well have the same issue.)