Kill the ASM versions of the mtx_lock_spin and friends. They were never

used on amd64, and were actually totally broken.  They had the wrong
calling conventions.  I believe the i386 versions are going away too.

Approved by:  re (scottl)

sys/amd64/include/mutex.h

@@ -33,7 +33,6 @@
 #define _MACHINE_MUTEX_H_
 
 #ifndef LOCORE
-
 #ifdef _KERNEL
 
 /* Global locks */
@@ -41,35 +40,5 @@ extern struct mtx	clock_lock;
 
 #endif	/* _KERNEL */
 
-#else	/* !LOCORE */
-
-/*
- * Simple assembly macros to get and release mutexes.
- *
- * Note: All of these macros accept a "flags" argument and are analoguous
- *	 to the mtx_lock_flags and mtx_unlock_flags general macros. If one
- *	 desires to not pass a flag, the value 0 may be passed as second
- *	 argument.
- *
- * XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
- *	all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
- *	locks) in the near future, however.
- */
-#define MTX_LOCK_SPIN(lck, flags)					\
-	pushq $0 ;							\
-	pushq $0 ;							\
-	pushq $flags ;							\
-	pushq $lck ;							\
-	call _mtx_lock_spin_flags ;					\
-	addq $0x20, %rsp ;						\
-
-#define MTX_UNLOCK_SPIN(lck)						\
-	pushq $0 ;							\
-	pushq $0 ;							\
-	pushq $0 ;							\
-	pushq $lck ;							\
-	call _mtx_unlock_spin_flags ;					\
-	addq $0x20, %rsp ;						\
-
 #endif	/* !LOCORE */
 #endif	/* __MACHINE_MUTEX_H */