[clang] Add check in SemaChecking for multiple unsequenced volatile accesses (PR #180955)

[Aaron Ballman via cfe-commits]

================

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AaronBallman wrote:

```suggestion
    x = v1 * v1;       // cxx11-warning {{unsequenced accesses to volatile 
qualified 'v1'}}
```
?

https://github.com/llvm/llvm-project/pull/180955
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