x86: fix !CONFIG_HVM build for clang 3.8

index 3959604287..e2cbcf53db 100644
@@ -379,6 +379,11 @@ unsigned long hvm_cr4_guest_valid_bits(const struct domain *d, bool restore);
 
 #define hvm_long_mode_active(v) (!!((v)->arch.hvm.guest_efer & EFER_LMA))
 
+static inline bool hvm_has_set_descriptor_access_exiting(void)
+{
+    return hvm_funcs.set_descriptor_access_exiting;
+}
+
 static inline int
 hvm_guest_x86_mode(struct vcpu *v)
 {

@@ -757,6 +762,11 @@ static inline void hvm_inject_hw_exception(unsigned int vector, int errcode)
     ASSERT_UNREACHABLE();
 }
 
+static inline bool hvm_has_set_descriptor_access_exiting(void)
+{
+    return false;
+}
+
 #define is_viridian_domain(d) ((void)(d), false)
 #define has_viridian_time_ref_count(d) ((void)(d), false)
 #define hvm_long_mode_active(v) ((void)(v), false)

index e02484f56b..4afb0665e8 100644
@@ -90,7 +90,7 @@ static inline uint32_t arch_monitor_get_capabilities(struct domain *d)
     if ( hvm_is_singlestep_supported() )
         capabilities |= (1U << XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP);
 
-    if ( hvm_funcs.set_descriptor_access_exiting )
+    if ( hvm_has_set_descriptor_access_exiting() )
         capabilities |= (1U << XEN_DOMCTL_MONITOR_EVENT_DESC_ACCESS);
 
     return capabilities;