[InstCombine] Regenerate test28_sub test case in xor.ll that I forgot to commit after fixing a typo in r310186.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310188 91177308-0d34-0410-b5e6-96231b3b80d8

Author: topperc

test/Transforms/InstCombine/xor.ll

@@ -355,7 +355,8 @@ define i32 @test28(i32 %indvar) {
 
 define i32 @test28_sub(i32 %indvar) {
 ; CHECK-LABEL: @test28_sub(
-; CHECK-NEXT:    ret i32 -2147483648
+; CHECK-NEXT:    [[T214:%.*]] = sub i32 1, [[INDVAR:%.*]]
+; CHECK-NEXT:    ret i32 [[T214]]
 ;
   %t7 = sub i32 -2147483647, %indvar
   %t214 = xor i32 %t7, -2147483648