PR bootstrap/101379 - libatomic arm build failure after r12-2132 due to -Warray-bounds on a constant address

libatomic/ChangeLog:
	* /config/linux/arm/host-config.h (__kernel_helper_version): New
	function.  Adjust shadow macro.

diff --git a/libatomic/config/linux/arm/host-config.h b/libatomic/config/linux/arm/host-config.h
index 1520f237d73..777d08a2b85 100644
--- a/libatomic/config/linux/arm/host-config.h
+++ b/libatomic/config/linux/arm/host-config.h
@@ -39,8 +39,14 @@ typedef void (__kernel_dmb_t) (void);
 #define __kernel_dmb (*(__kernel_dmb_t *) 0xffff0fa0)
 
 /* Kernel helper page version number.  */
-#define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
+static inline unsigned*
+__kernel_helper_version ()
+{
+  unsigned *volatile addr = (unsigned int *)0xffff0ffc;
+  return addr;
+}
 
+#define __kernel_helper_version (*__kernel_helper_version())
 
 #ifndef HAVE_STREX
 static inline bool