update godbolt link and add TODO to a64l

Author: michaelrj-google

libc/src/stdlib/a64l.cpp

@@ -40,6 +40,7 @@ constexpr static int32_t b64_char_to_int(char ch) {
 
 // This function takes a base 64 string and writes it to the low 32 bits of a
 // long.
+// TODO: use LIBC_ADD_NULL_CHECKS for checking if the input is a null pointer.
 LLVM_LIBC_FUNCTION(long, a64l, (const char *s)) {
   // the standard says to only use up to 6 characters.
   constexpr size_t MAX_LENGTH = 6;

libc/src/stdlib/l64a.cpp

@@ -39,7 +39,7 @@ constexpr static char b64_int_to_char(uint32_t num) {
   // this tolower is technically unnecessary, but it provides safety if we
   // change the default behavior of int_to_b36_char. Also the compiler
   // completely elides it so there's no performance penalty, see:
-  // https://godbolt.org/z/sfxdhYvYb TODO: UPDATE THIS LINK
+  // https://godbolt.org/z/o5ennv7fc
   return static_cast<char>(
       internal::tolower(internal::int_to_b36_char(num - 2 - 26)));
 }