[libcxx-commits] [libcxx] [libc++] Replace __resize_default_init with resize_and_overwrite (PR #157121)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

> LGTM but let's make sure the benchmarks are not negatively impacted.

Since we didn't have any benchmarks yet, I've added one, and the numbers seem pretty good:
```
-----------------------------------------------------------
Benchmark                               old             new
-----------------------------------------------------------
BM_StringResizeAndOverwrite         8.39 ns         5.66 ns
```


https://github.com/llvm/llvm-project/pull/157121