x86: Nuke GET_THREAD_INFO_WITH_ESP() macro for i386

According to a git log -p, GET_THREAD_INFO_WITH_ESP() has only been defined
and never been used. Get rid of it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20140206144321.409045251@goodmis.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/include/asm/thread_info.h

@@ -182,10 +182,6 @@ static inline struct thread_info *current_thread_info(void)
 	movl $-THREAD_SIZE, reg; \
 	andl %esp, reg
 
-/* use this one if reg already contains %esp */
-#define GET_THREAD_INFO_WITH_ESP(reg) \
-	andl $-THREAD_SIZE, reg
-
 #endif
 
 #else /* X86_32 */