[clang] [Clang] Fix double revert of a keyword token that was cached before the first fallback (PR #219799)

[Shengxin Pei via cfe-commits]

https://github.com/TPPPP72 commented:

Please simplify the test case to:

```cpp
i < 0

void f() {
    struct __is_pod;
    struct __is_pod;
}
```

https://github.com/llvm/llvm-project/pull/219799
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