Fix gdb.error

Author: winner245

libcxx/include/bitset

@@ -147,6 +147,7 @@ template <size_t N> struct hash<std::bitset<N>>;
 #  include <__functional/hash.h>
 #  include <__functional/identity.h>
 #  include <__functional/unary_function.h>
+#  include <__type_traits/integral_constant.h>
 #  include <__type_traits/is_char_like_type.h>
 #  include <climits>
 #  include <stdexcept>
@@ -222,10 +223,10 @@ protected:
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void flip() _NOEXCEPT;
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong() const {
-    return to_ulong(integral_constant < bool, _Size< sizeof(unsigned long) * CHAR_BIT>());
+    return to_ulong(_BoolConstant < _Size< sizeof(unsigned long) * CHAR_BIT>());
   }
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong() const {
-    return to_ullong(integral_constant < bool, _Size< sizeof(unsigned long long) * CHAR_BIT>());
+    return to_ullong(_BoolConstant < _Size< sizeof(unsigned long long) * CHAR_BIT>());
   }
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 bool all() const _NOEXCEPT { return !__scan_bits(__bit_not()); }
@@ -342,7 +343,7 @@ inline _LIBCPP_CONSTEXPR __bitset<_N_words, _Size>::__bitset(unsigned long long
 #  endif
 {
 #  ifdef _LIBCPP_CXX03_LANG
-  __init(__v, integral_constant<bool, sizeof(unsigned long long) <= sizeof(__storage_type)>());
+  __init(__v, _BoolConstant<sizeof(unsigned long long) <= sizeof(__storage_type)>());
 #  endif
 }
 
@@ -384,9 +385,7 @@ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void __bitset<_N_words, _Siz
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
 __bitset<_N_words, _Size>::to_ulong(false_type) const {
-  __const_iterator __e = __make_iter(_Size);
-  __const_iterator __i = std::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true);
-  if (__i != __e)
+  if (auto __e = __make_iter(_Size); std::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true) != __e)
     std::__throw_overflow_error("bitset to_ulong overflow error");
 
   return to_ulong(true_type());
@@ -395,7 +394,7 @@ __bitset<_N_words, _Size>::to_ulong(false_type) const {
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
 __bitset<_N_words, _Size>::to_ulong(true_type) const {
-  return to_ulong(true_type(), integral_constant<bool, sizeof(__storage_type) < sizeof(unsigned long)>());
+  return to_ulong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long)>());
 }
 
 template <size_t _N_words, size_t _Size>
@@ -410,19 +409,15 @@ __bitset<_N_words, _Size>::to_ulong(true_type, true_type) const {
   unsigned long __r = static_cast<unsigned long>(__first_[0]);
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshift-count-overflow")
-  const size_t __ul_words = sizeof(unsigned long) / sizeof(__storage_type);
-  const size_t __n_words  = _N_words < __ul_words ? _N_words : __ul_words;
-  for (size_t __i = 1; __i < __n_words; ++__i)
+  for (size_t __i = 1; __i < _N_words; ++__i)
     __r |= static_cast<unsigned long>(__first_[__i]) << (__bits_per_word * __i);
   _LIBCPP_DIAGNOSTIC_POP
   return __r;
 }
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
 __bitset<_N_words, _Size>::to_ullong(false_type) const {
-  __const_iterator __e = __make_iter(_Size);
-  __const_iterator __i = std::find(__make_iter(sizeof(unsigned long long) * CHAR_BIT), __e, true);
-  if (__i != __e)
+  if (auto __e = __make_iter(_Size); std::find(__make_iter(sizeof(unsigned long long) * CHAR_BIT), __e, true) != __e)
     std::__throw_overflow_error("bitset to_ullong overflow error");
 
   return to_ullong(true_type());
@@ -431,7 +426,7 @@ __bitset<_N_words, _Size>::to_ullong(false_type) const {
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
 __bitset<_N_words, _Size>::to_ullong(true_type) const {
-  return to_ullong(true_type(), integral_constant<bool, sizeof(__storage_type) < sizeof(unsigned long long)>());
+  return to_ullong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long long)>());
 }
 
 template <size_t _N_words, size_t _Size>
@@ -446,9 +441,7 @@ __bitset<_N_words, _Size>::to_ullong(true_type, true_type) const {
   unsigned long long __r = static_cast<unsigned long long>(__first_[0]);
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshift-count-overflow")
-  const size_t __ull_words = sizeof(unsigned long long) / sizeof(__storage_type);
-  const size_t __n_words   = _N_words < __ull_words ? _N_words : __ull_words;
-  for (size_t __i = 1; __i < __n_words; ++__i)
+  for (size_t __i = 1; __i < _N_words; ++__i)
     __r |= static_cast<unsigned long long>(__first_[__i]) << (__bits_per_word * __i);
   _LIBCPP_DIAGNOSTIC_POP
   return __r;
@@ -540,11 +533,7 @@ 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_(_Size == __bits_per_word ? static_cast<__storage_type>(__v) : static_cast<__storage_type>(__v)) {}
 
 template <size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void