[libc++] Optimize basic_string::append(Iter, Iter)

[philnik777]

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⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff origin/main HEAD --extensions ,cpp -- libcxx/include/string libcxx/test/benchmarks/containers/string.bench.cpp --diff_from_common_commit

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View the diff from clang-format here.

diff --git a/libcxx/test/benchmarks/containers/string.bench.cpp b/libcxx/test/benchmarks/containers/string.bench.cpp
index 68249ad89..8fb1d1a21 100644
--- a/libcxx/test/benchmarks/containers/string.bench.cpp
+++ b/libcxx/test/benchmarks/containers/string.bench.cpp
@@ -128,7 +128,7 @@ BENCHMARK(BM_StringResizeAndOverwrite);
 template <class Container>
 static void BM_StringAppend(benchmark::State& state) {
   std::string orig_str = "This is some data so the string isn't empty";
-  std::string str = orig_str;
+  std::string str      = orig_str;
 
   const char to_append_str[] = "This is a long string to make sure append does some work";
   Container to_append;