[PowerPC] adjust test for uaddo change in rL353001

We don't need a mtctr/bctr for this test now; a regular
conditional branch is fine.

llvm-svn: 353002

Author: rotateright

llvm/test/CodeGen/PowerPC/ctrloop-shortLoops.ll

@@ -82,9 +82,8 @@ for.body:                                         ; preds = %entry, %for.body
 
 ; Function Attrs: norecurse nounwind
 define signext i32 @testTripCount2NonSmallLoop() {
-
 ; CHECK-LABEL: testTripCount2NonSmallLoop:
-; CHECK: mtctr
+; CHECK: bge
 ; CHECK: blr
 
 entry: