src: port GetLoadedLibraries for freebsd

the dl_iterate_phdr and its associated data structure in Linux are fully available in freebsd as well, so opening it up for freebsd means just opening up the platform specific identifiers. Refs: #24825 PR-URL: #25106 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Author: gireeshpunathil

src/debug_utils.cc

@@ -30,9 +30,9 @@
 
 #endif // __POSIX__
 
-#if defined(__linux__) || defined(__sun)
+#if defined(__linux__) || defined(__sun) || defined(__FreeBSD__)
 #include <link.h>
-#endif // (__linux__) || defined(__sun)
+#endif // (__linux__) || defined(__sun) || defined(__FreeBSD__)
 
 #ifdef __APPLE__
 #include <mach-o/dyld.h> // _dyld_get_image_name()
@@ -322,7 +322,7 @@ void CheckedUvLoopClose(uv_loop_t* loop) {
 
 std::vector<std::string> NativeSymbolDebuggingContext::GetLoadedLibraries() {
  std::vector<std::string> list;
-#ifdef __linux__
+#if defined(__linux__) || defined(__FreeBSD__)
  dl_iterate_phdr(
  [](struct dl_phdr_info* info, size_t size, void* data) {
  auto list = static_cast<std::vector<std::string>*>(data);