[libc-commits] [libc] [libc] Add front() and erase() to FixedVector (PR #213866)

[Jeff Bailey via libc-commits]

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kaladron wrote:

As above:

```suggestion
    LIBC_ASSERT(end >= begin && static_cast<size_t>(end - begin) <= CAPACITY);
```

https://github.com/llvm/llvm-project/pull/213866