Implement HlClearInterruptFlag() and HlSetInterruptFlag() intrinsic routines

sdk/xtdk/amd64/hlfuncs.h

@@ -18,6 +18,10 @@
 extern ULONG ComPortAddress[];
 
 /* HAL library routines forward references */
+XTCDECL
+VOID
+HlClearInterruptFlag();
+
 XTCDECL
 BOOLEAN
 HlCpuId(IN OUT PCPUID_REGISTERS Registers);
@@ -39,6 +43,10 @@ XTCDECL
 ULONG_PTR
 HlReadControlRegister(IN USHORT ControlRegister);
 
+XTCDECL
+VOID
+HlSetInterruptFlag();
+
 XTCDECL
 VOID
 HlWriteControlRegister(IN USHORT ControlRegister,