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Summary:
### Problem
ArrayRef's `equals()`does elementwise quality using `==` operator. This can cause a DDE for unbacked symints since `==` operator calls `guard_bool`.
```
// SymInt.h
bool operator==(const SymInt& o) const {
return sym_eq(o).guard_bool(__FILE__, __LINE__);
}
```
### Solution
Adds `sym_equals()` to do elementwise equality for `SymIntArrayRef`. Use this instead of `equals()` for `SymIntArrayRef`.
Reviewed By: guangy10, pianpwk, muchulee8
Differential Revision: D84168401
Pull Request resolved: https://github.com/pytorch/pytorch/pull/165112
Approved by: https://github.com/Skylion007