Rename __clz to xenomai_count_leading_zeros

This is to avoid namespace conflicts (e.g.: with Clang's arm_acle.h)
Signed-off-by: Giulio Moro <giuliomoro@yahoo.it>
[Jan: back-ported to 3.0.x]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

include/boilerplate/compiler.h

@@ -83,7 +83,7 @@ void __invalid_operand_size(void);
 		__ret;							\
 	})
 
-#define __clz(__v)							\
+#define xenomai_count_leading_zeros(__v)				\
 	({								\
 		int __ret;						\
 		if (!__v)						\

lib/copperplate/heapobj-pshared.c

@@ -439,7 +439,8 @@ static void *alloc_block(struct shared_heap *heap, size_t size)
 	 */
 	if (size <= HOBJ_PAGE_SIZE * 2) {
 		/* Find log2(size). */
-		log2size = sizeof(size) * 8 - 1 - __clz(size);
+		log2size = sizeof(size) * 8 - 1 -
+			xenomai_count_leading_zeros(size);
 		if (size & (size - 1))
 			log2size++;
 		/* That is the actual block size we need. */