Enable gold threaded link

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 15ff58c70a7718e90aae0a746ab15986090bd939..30d801789d8a36aeab008f75aeedea2afacebe79 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -208,8 +208,7 @@ config("compiler") {
     }
 
     # Linker warnings.
-    if ( fatal_linker_warnings &&
-        !(is_chromeos && current_cpu == "arm") &&
+    if (fatal_linker_warnings && !(is_chromeos && current_cpu == "arm") &&
         !(is_android && use_order_profiling) && !is_mac && !is_ios) {
       # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
       # TODO(lizeb,pasko): Fix link errors when linking with order_profiling=1
@@ -318,18 +317,19 @@ config("compiler") {
         cflags += [ "-mstackrealign" ]
       }
     } else {
-      ldflags += [
-        "-B$gold_path",
-        # Experimentation found that using four linking threads
-        # saved ~20% of link time.
-        # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
-        # Only apply this to the target linker, since the host
-        # linker might not be gold, but isn't used much anyway.
-        # TODO(raymes): Disable threading because gold is frequently
-        # crashing on the bots: crbug.com/161942.
-        #"-Wl,--threads",
-        #"-Wl,--thread-count=4",
-      ]
+      ldflags += [ "-B$gold_path" ]
+
+      if (linux_use_bundled_binutils) {
+        ldflags += [
+          # Experimentation found that using four linking threads
+          # saved ~20% of link time.
+          # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
+          # Only apply this to the target linker, since the host
+          # linker might not be gold, but isn't used much anyway.
+          "-Wl,--threads",
+          "-Wl,--thread-count=4",
+        ]
+      }
     }
 
     if (gdb_index) {