Fix ia64 build breakage by adding newly needed #include

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Merge tag 'please-pull-fixia64' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull ia64 build fix from Tony Luck:
 "Fix ia64 build breakage by adding newly needed #include"

We're still debating the patch that caused the build breakage, but this
fix seems like a good idea regardless of how that ends up being handled.

* tag 'please-pull-fixia64' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  [IA64] Fix include dependency in asm/irqflags.h

arch/ia64/include/asm/irqflags.h

@@ -11,6 +11,7 @@
 #define _ASM_IA64_IRQFLAGS_H
 
 #include <asm/pal.h>
+#include <asm/kregs.h>
 
 #ifdef CONFIG_IA64_DEBUG_IRQ
 extern unsigned long last_cli_ip;