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

[Michael Meissner]

https://gcc.gnu.org/g:8a0ca5a844a291cddd052f0f06aaba630b04a271

commit 8a0ca5a844a291cddd052f0f06aaba630b04a271
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Nov 5 23:07:20 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