[libc++] Refactor memory allocation in basic_string

[philnik777]

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[github-actions]

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

You can test this locally with the following command:

git-clang-format --diff 72791fef6d6c84b72cb961b288b25283bea97310 c4657a704e79898bc5357f97baa7505945b8de92 --extensions ,h,cpp -- libcxx/include/__memory/allocate_at_least.h libcxx/include/string libcxx/src/string.cpp libcxx/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp

View the diff from clang-format here.

diff --git a/libcxx/include/string b/libcxx/include/string
index 3330c7e434..e6be2c460a 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -2323,7 +2323,7 @@ private:
         auto __alloc      = __str.__alloc_;
         auto __allocation = __allocate_long_buffer(__alloc, __str.size());
         __replace_internal_buffer(__allocation, __str.size());
-        __alloc_   = std::move(__alloc);
+        __alloc_ = std::move(__alloc);
       }
     }
   }