Vidush Singhal c7633ddb28 [Attributor]: Ensure cycle info is not null when handling PHI in AAPointerInfo (#97321) ...

Ensure cycle info object is not null for simple PHI case

for the test:
`llvm/test/Transforms/Attributor/phi_bug_pointer_info.ll`

Debug info Before the change: 

```
Accesses by bin after update:
[8-12] : 1
     - 9 -   store i32 %0, ptr %field2, align 4
       - c:   %0 = load i32, ptr %val, align 4
[32-36] : 1
     - 9 -   store i32 %1, ptr %field8, align 4
       - c:   %1 = load i32, ptr %val2, align 4
[2147483647-4294967294] : 1
     - 6 -   %ret = load i32, ptr %x, align 4
       - c: <unknown>
```

Debug info After the change: 

```
Accesses by bin after update:
[8-12] : 2
     - 9 -   store i32 %0, ptr %field2, align 4
       - c:   %0 = load i32, ptr %val, align 4
     - 6 -   %ret = load i32, ptr %x, align 4
       - c: <unknown>
[32-36] : 2
     - 9 -   store i32 %1, ptr %field8, align 4
       - c:   %1 = load i32, ptr %val2, align 4
     - 6 -   %ret = load i32, ptr %x, align 4
       - c: <unknown>
```

Co-authored-by: Vidush Singhal <singhal2@ruby964.llnl.gov>

2024-07-01 17:20:34 -07:00

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