s390/entry: shorten OUTSIDE macro

Since the minimum architecture level has been raised to z10 a shorter
instruction sequence can be used to implement the OUTSIDE macro. This
also reduces the number of used registers within that macro to one.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/kernel/entry.S

@@ -169,11 +169,9 @@ _LPP_OFFSET	= __LC_LPP
 	 * @outside_label: jump here if @reg is outside of [@start..@end)
 	 */
 	.macro OUTSIDE reg,start,end,outside_label
-	lgr	%r14,\reg
-	larl	%r13,\start
-	slgr	%r14,%r13
-	lghi	%r13,\end - \start
-	clgr	%r14,%r13
+	larl	%r14,\start
+	slgrk	%r14,\reg,%r14
+	clgfi	%r14,\end - \start
 	jhe	\outside_label
 	.endm