[llvm] [LV][NFC] Remove undef values in some test cases (PR #164401)

[Florian Hahn via llvm-commits]

================
@@ -12,12 +12,12 @@ entry:
 
 loop:
   %tmp3 = phi i64 [ 0, %entry ], [ %tmp18, %loop ]
-  %tmp4 = getelementptr inbounds %struct.foo, ptr %ptr, i64 undef
+  %tmp4 = getelementptr inbounds %struct.foo, ptr %ptr, i64 0
----------------
fhahn wrote:

```suggestion
  %tmp4 = getelementptr inbounds %struct.foo, ptr %ptr
```

https://github.com/llvm/llvm-project/pull/164401