powerpc/64s: Avoid a branch in masked_[H]interrupt()

Interrupts which do not require EE to be cleared can all be tested
with a single bitwise test.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/exceptions-64s.S

@@ -1370,10 +1370,8 @@ masked_##_H##interrupt:					\
 	ori	r10,r10,0xffff;				\
 	mtspr	SPRN_DEC,r10;				\
 	b	MASKED_DEC_HANDLER_LABEL;		\
-1:	cmpwi	r10,PACA_IRQ_DBELL;			\
-	beq	2f;					\
-	cmpwi	r10,PACA_IRQ_HMI;			\
-	beq	2f;					\
+1:	andi.	r10,r10,(PACA_IRQ_DBELL|PACA_IRQ_HMI);	\
+	bne	2f;					\
 	mfspr	r10,SPRN_##_H##SRR1;			\
 	rldicl	r10,r10,48,1; /* clear MSR_EE */	\
 	rotldi	r10,r10,16;				\