[gcc r13-1561] libstdc++: Remove workaround in __gnu_cxx::char_traits::move [PR89074]

[Jonathan Wakely]

https://gcc.gnu.org/g:ad6135e261ced29972e5aa33404e45bcdd99440f

commit r13-1561-gad6135e261ced29972e5aa33404e45bcdd99440f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jul 7 13:40:20 2022 +0100

    libstdc++: Remove workaround in __gnu_cxx::char_traits::move [PR89074]
    
    The front-end bug that prevented this constexpr loop from working has
    been fixed since GCC 12.1 so we can remove the workaround.
    
    libstdc++-v3/ChangeLog:
    
            PR c++/89074
            * include/bits/char_traits.h (__gnu_cxx::char_traits::move):
            Remove workaround for front-end bug.

Diff:
---
 libstdc++-v3/include/bits/char_traits.h | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/libstdc++-v3/include/bits/char_traits.h b/libstdc++-v3/include/bits/char_traits.h
index b856b1da320..965ff29b75c 100644
--- a/libstdc++-v3/include/bits/char_traits.h
+++ b/libstdc++-v3/include/bits/char_traits.h
@@ -215,14 +215,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	{
 	  if (__s1 == __s2) // unlikely, but saves a lot of work
 	    return __s1;
-#if __cpp_constexpr_dynamic_alloc
-	  // The overlap detection below fails due to PR c++/89074,
-	  // so use a temporary buffer instead.
-	  char_type* __tmp = new char_type[__n];
-	  copy(__tmp, __s2, __n);
-	  copy(__s1, __tmp, __n);
-	  delete[] __tmp;
-#else
 	  const auto __end = __s2 + __n - 1;
 	  bool __overlap = false;
 	  for (std::size_t __i = 0; __i < __n - 1; ++__i)
@@ -244,7 +236,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    }
 	  else
 	    copy(__s1, __s2, __n);
-#endif
 	  return __s1;
 	}
 #endif