Export of internal Abseil changes

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ef529b5fc5d72de02c145ae6643af0465090252b by Abseil Team <absl-team@google.com>:

Fix typo in comment (foo -> i).

PiperOrigin-RevId: 334894645

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18aab6f6c71e6abd83d467dbf8868df24100e710 by Abseil Team <absl-team@google.com>:

Fix -Wno-sign-compare error

PiperOrigin-RevId: 334837327
GitOrigin-RevId: ef529b5fc5d72de02c145ae6643af0465090252b
Change-Id: Ieeedf1a4fd458eb38ffbda0ca77a47021b510043

absl/debugging/symbolize_darwin.inc

@@ -77,8 +77,8 @@ bool Symbolize(const void* pc, char* out, int out_size) {
 
   char tmp_buf[1024];
   if (debugging_internal::Demangle(symbol.c_str(), tmp_buf, sizeof(tmp_buf))) {
-    int len = strlen(tmp_buf);
-    if (len + 1 <= out_size) {  // +1 for '\0'
+    size_t len = strlen(tmp_buf);
+    if (len + 1 <= static_cast<size_t>(out_size)) {  // +1 for '\0'
       assert(len < sizeof(tmp_buf));
       memmove(out, tmp_buf, len + 1);
     }

absl/flags/internal/usage.cc

@@ -145,7 +145,8 @@ class FlagHelpPrettyPrinter {
       }
 
       // Write the token, ending the string first if necessary/possible.
-      if (!new_line && (line_len_ + token.size() >= max_line_len_)) {
+      if (!new_line &&
+          (line_len_ + static_cast<int>(token.size()) >= max_line_len_)) {
         EndLine();
         new_line = true;
       }

absl/status/statusor.h

@@ -129,7 +129,7 @@ class ABSL_MUST_USE_RESULT StatusOr;
 // Example:
 //
 //   absl::StatusOr<int> i = GetCount();
-//   if (foo.ok()) {
+//   if (i.ok()) {
 //     updated_total += *i
 //   }
 //

absl/strings/internal/charconv_parse.cc

@@ -405,7 +405,7 @@ strings_internal::ParsedFloat ParseFloat(const char* begin, const char* end,
       }
       exponent_adjustment -= static_cast<int>(zeros_skipped);
     }
-    std::size_t post_decimal_digits = ConsumeDigits<base>(
+    int64_t post_decimal_digits = ConsumeDigits<base>(
         begin, end, digits_left, &mantissa, &mantissa_is_inexact);
     begin += post_decimal_digits;