Allow dumping just CFI data from debug symbols

src/tools/linux/dump_syms/dump_syms.cc

Index: src/tools/linux/dump_syms/dump_syms.cc
===================================================================
--- a/src/tools/linux/dump_syms/dump_syms.cc
+++ b/src/tools/linux/dump_syms/dump_syms.cc
@@ -63,15 +63,16 @@ int main(int argc, char **argv) {
   std::vector<string> debug_dirs;
   binary = argv[binary_index];
   for (int debug_dir_index = binary_index + 1;
        debug_dir_index < argc;
        ++debug_dir_index) {
     debug_dirs.push_back(argv[debug_dir_index]);
   }
 
-  if (!WriteSymbolFile(binary, debug_dirs, cfi, std::cout)) {
+  SymbolData symbol_data = cfi ? ALL_SYMBOL_DATA : NO_CFI;
+  if (!WriteSymbolFile(binary, debug_dirs, symbol_data, std::cout)) {
     fprintf(stderr, "Failed to write symbol file.\n");
     return 1;
   }
 
   return 0;
 }