Explicitly initialize __bit_per_word to avoid gdb.error

Author: winner245

libcxx/include/bitset

@@ -519,16 +519,15 @@ protected:
   _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT;
 };
 
+template <size_t _Size>
+const unsigned __bitset<1, _Size>::__bits_per_word;
+
 template <size_t _Size>
 inline _LIBCPP_CONSTEXPR __bitset<1, _Size>::__bitset() _NOEXCEPT : __first_(0) {}
 
 template <size_t _Size>
 inline _LIBCPP_CONSTEXPR __bitset<1, _Size>::__bitset(unsigned long long __v) _NOEXCEPT
-    : __first_(static_cast<__storage_type>(__v)) {
-  // Force __bits_per_word to be instantiated to avoid "gdb.error: There is no member or method named
-  // __bits_per_word"
-  (void)__bits_per_word;
-}
+    : __first_(static_cast<__storage_type>(__v)) {}
 
 template <size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void