linux-user: Save/restore fpu registers to signal context on sh4
As "todo" comment in source code. And modify restore_sigcontext() to have three args as kernel's does. Signed-off-by: NTakashi YOSHII <takasi-y@ops.dti.ne.jp> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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