powerpc/32s: Fix LLVM SMP build

LLVM assembler does not recognise 3-operand cmpi, use cmpwi.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230606131828.315427-1-npiggin@gmail.com

arch/powerpc/mm/book3s32/hash_low.S

@@ -199,12 +199,12 @@ _GLOBAL(add_hash_page)
 	lis	r6, (mmu_hash_lock - PAGE_OFFSET)@ha
 	addi	r6, r6, (mmu_hash_lock - PAGE_OFFSET)@l
 10:	lwarx	r0,0,r6			/* take the mmu_hash_lock */
-	cmpi	0,r0,0
+	cmpwi	0,r0,0
 	bne-	11f
 	stwcx.	r8,0,r6
 	beq+	12f
 11:	lwz	r0,0(r6)
-	cmpi	0,r0,0
+	cmpwi	0,r0,0
 	beq	10b
 	b	11b
 12:	isync
@@ -512,12 +512,12 @@ _GLOBAL(flush_hash_pages)
 	lwz	r8, TASK_CPU(r8)
 	oris	r8,r8,9
 10:	lwarx	r0,0,r9
-	cmpi	0,r0,0
+	cmpwi	0,r0,0
 	bne-	11f
 	stwcx.	r8,0,r9
 	beq+	12f
 11:	lwz	r0,0(r9)
-	cmpi	0,r0,0
+	cmpwi	0,r0,0
 	beq	10b
 	b	11b
 12:	isync