#Centipede Fix compile issue with `string_view`

For some vendors, `std::string_view::const_iterator != const char*`. More
generally, we should always use `.data()` when dealing with string operations
for `string_view`.

PiperOrigin-RevId: 618837412

centipede/environment.cc

diff --git a/centipede/environment.cc b/centipede/environment.cc
index 8644a08..104bd95 100644
--- a/centipede/environment.cc
+++ b/centipede/environment.cc
@@ -92,7 +92,8 @@
 // Returns `value` as a size_t, CHECK-fails on parse error.
 static size_t GetIntFlag(std::string_view value) {
   size_t result{};
-  CHECK(std::from_chars(value.begin(), value.end(), result).ec == std::errc())
+  CHECK(std::from_chars(value.data(), value.data() + value.size(), result).ec ==
+        std::errc())
       << value;
   return result;
 }

centipede/util.cc

diff --git a/centipede/util.cc b/centipede/util.cc
index f5f7e37..614373d 100644
--- a/centipede/util.cc
+++ b/centipede/util.cc
@@ -352,7 +352,7 @@
     if (stop == start) return false;  // no closing "
     // Replace special characters and hex values.
     std::string replaced = absl::StrReplaceAll(
-        std::string_view(line.begin() + start, stop - start), replacements);
+        std::string_view(line.data() + start, stop - start), replacements);
     dictionary_entries.emplace_back(replaced.begin(), replaced.end());
   }
   return true;