Fix the build with perfc=y.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>

diff -r b320cfe1f10f xen/include/asm-x86/perfc_defn.h
--- a/xen/include/asm-x86/perfc_defn.h	Thu Jun 05 13:04:07 2008 +0100
+++ b/xen/include/asm-x86/perfc_defn.h	Tue Jun 10 10:25:16 2008 +0900
@@ -77,7 +77,8 @@ PERFCOUNTER(shadow_writeable_h_1,  "shad
 PERFCOUNTER(shadow_writeable_h_1,  "shadow writeable: 32b w2k3")
 PERFCOUNTER(shadow_writeable_h_2,  "shadow writeable: 32pae w2k3")
 PERFCOUNTER(shadow_writeable_h_3,  "shadow writeable: 64b w2k3")
-PERFCOUNTER(shadow_writeable_h_4,  "shadow writeable: linux/solaris")
+PERFCOUNTER(shadow_writeable_h_4,  "shadow writeable: linux low/solaris")
+PERFCOUNTER(shadow_writeable_h_5,  "shadow writeable: linux high")
 PERFCOUNTER(shadow_writeable_bf,   "shadow writeable brute-force")
 PERFCOUNTER(shadow_mappings,       "shadow removes all mappings")
 PERFCOUNTER(shadow_mappings_bf,    "shadow rm-mappings brute-force")