[llvm] [libc] [libc] Add more functions in CPP/bit.h (PR #73814)

[Clement Courbet via llvm-commits]

================
@@ -24,77 +25,72 @@ constexpr long long LLONG_MIN = 1LL << (LLONG_BIT_WIDTH - 1);
 constexpr unsigned long long ULLONG_MAX = ~0ULL;
 #endif
 
-template <class T> class numeric_limits {
----------------
legrosbuffle wrote:

Maybe submit this separately ?

https://github.com/llvm/llvm-project/pull/73814