x86, signals: fix xine & firefox bustage
x86, signals: fix xine & firefox bustage

Impact: fix bad frame in rt_sigreturn on 64-bit

After commit 97286a2b64725aac2d584ddd1f94871f9991d5a1 some applications
fail to return from signal handler:

[  145.150133] firefox[3250] bad frame in rt_sigreturn frame:00007f902b44eb28 ip:352e80b307 sp:7f902b44ef70 orax:ffffffffffffffff in libpthread-2.9.so[352e800000+17000]
[  665.519017] firefox[5420] bad frame in rt_sigreturn frame:00007faa8deaeb28 ip:352e80b307 sp:7faa8deaef70 orax:ffffffffffffffff in libpthread-2.9.so[352e800000+17000]

The root cause is forgetting to keep 64 byte aligned value of
fpstate for next stack pointer calculation.

Reported-by: Jaswinder Singh Rajput <0d2c21fea8cf44f0b0c47c284391933a8a37a292@kernel.org>
Reported-by: Mike Galbraith <3cfa3897b7f55b5396b7a47c83b66325184bc9b4@gmx.de>
Signed-off-by: Hiroshi Shimamoto <db8c2e91c9f58451d767d75787c2de778d30f637@ct.jp.nec.com>
LKML-Reference: <55ae57711203f9646e955736c1d6bc57d0fccfab@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas