[AVR] Use the short form of 'clr <reg>'

r318895 made it so that the simpler instruction aliases are printed
rather than their expanded form.

llvm-svn: 318954
diff --git a/llvm/test/CodeGen/AVR/mul.ll b/llvm/test/CodeGen/AVR/mul.ll
index 3756abe..2f16934 100644
--- a/llvm/test/CodeGen/AVR/mul.ll
+++ b/llvm/test/CodeGen/AVR/mul.ll
@@ -3,7 +3,7 @@
 define i8 @mult8(i8 %a, i8 %b) {
 ; CHECK-LABEL: mult8:
 ; CHECK: muls r22, r24
-; CHECK: eor  r1, r1
+; CHECK: clr r1
 ; CHECK: mov  r24, r0
   %mul = mul i8 %b, %a
   ret i8 %mul
@@ -16,10 +16,10 @@
 ; CHECK: mul  r22, r24
 ; CHECK: mov  r19, r0
 ; CHECK: mov  r20, r1
-; CHECK: eor  r1,  r1
+; CHECK: clr r1
 ; CHECK: add  r20, r18
 ; CHECK: muls r23, r24
-; CHECK: eor  r1,  r1
+; CHECK: clr r1
 ; CHECK: mov  r22, r0
 ; CHECK: add  r22, r20
 ; :TODO: finish after reworking shift instructions