[gcc(refs/users/meissner/heads/work223-test)] Revert changes

[Michael Meissner]

https://gcc.gnu.org/g:9ff53f8be69d213121807c884b07d4f8cf1405d6

commit 9ff53f8be69d213121807c884b07d4f8cf1405d6
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Nov 5 23:03:01 2025 -0500

    Revert changes

Diff:
---
 libstdc++-v3/include/std/limits | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/libstdc++-v3/include/std/limits b/libstdc++-v3/include/std/limits
index 24fb375c9cb0..49ce7c935e9d 100644
--- a/libstdc++-v3/include/std/limits
+++ b/libstdc++-v3/include/std/limits
@@ -2067,16 +2067,9 @@ __glibcxx_float_n(128)
       quiet_NaN() _GLIBCXX_USE_NOEXCEPT
       { return __gnu_cxx::__bfloat16_t(__builtin_nanf("")); }
 
-#ifdef _ARCH_PPC
-      static _GLIBCXX_CONSTEXPR __gnu_cxx::__bfloat16_t
-      signaling_NaN() _GLIBCXX_USE_NOEXCEPT
-      { return __gnu_cxx::__bfloat16_t(__builtin_nansf("")); }
-
-#else
       static _GLIBCXX_CONSTEXPR __gnu_cxx::__bfloat16_t
       signaling_NaN() _GLIBCXX_USE_NOEXCEPT
       { return __builtin_nansf16b(""); }
-#endif
 
       static _GLIBCXX_CONSTEXPR __gnu_cxx::__bfloat16_t
       denorm_min() _GLIBCXX_USE_NOEXCEPT