ppc64: move stack switching up in interrupt processing

This will make the ppc64 multiplatform irq handling more like
the generic handling.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/include/asm-powerpc/irq.h b/include/asm-powerpc/irq.h
index b3935ea..2a768e0 100644
--- a/include/asm-powerpc/irq.h
+++ b/include/asm-powerpc/irq.h
@@ -488,8 +488,8 @@
 
 extern void irq_ctx_init(void);
 extern void call_do_softirq(struct thread_info *tp);
-extern int call_handle_IRQ_event(int irq, struct pt_regs *regs,
-			struct irqaction *action, struct thread_info *tp);
+extern int call_ppc_irq_dispatch_handler(struct pt_regs *regs, int irq,
+		struct thread_info *tp);
 
 #define __ARCH_HAS_DO_SOFTIRQ