x86, asmlinkage: Change dotraplinkage into __visible on 32bit

Mark 32bit dotraplinkage functions as __visible for LTO.
64bit already is using asmlinkage which includes it.

v2: Clean up (M.Marek)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1375740170-7446-3-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/include/asm/traps.h

@@ -6,11 +6,7 @@
 #include <asm/debugreg.h>
 #include <asm/siginfo.h>			/* TRAP_TRACE, ... */
 
-#ifdef CONFIG_X86_32
-#define dotraplinkage
-#else
-#define dotraplinkage asmlinkage
-#endif
+#define dotraplinkage __visible
 
 asmlinkage void divide_error(void);
 asmlinkage void debug(void);