GN: Use gold linker for arm64

build/config/android/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/sysroot.gni")
 
 assert(is_android)
 
@@ skipping 26 matching lines @@
     if (current_cpu == "mipsel") {
       cflags += [
         # TODO(gordanac) Enable integrated-as.
         "-no-integrated-as",
         "-B${rebased_android_toolchain_root}/bin",  # Else /usr/bin/as gets picked up.
       ]
     }
   }
 
   # Use gold for Android for most CPU architectures.
-  if (current_cpu == "x86" || current_cpu == "x64" || current_cpu == "arm") {
+  if (current_cpu == "x86" || current_cpu == "x64" || current_cpu == "arm" ||
+      current_cpu == "arm64") {
     ldflags += [ "-fuse-ld=gold" ]
     if (is_clang) {
       # Let clang find the ld.gold in the NDK.
       ldflags += [ "--gcc-toolchain=$rebased_android_toolchain_root" ]
     }
 
     # Use -mstackrealign due to a bug on ia32 Jelly Bean.
     # See crbug.com/521527
     if (current_cpu == "x86") {
       cflags += [ "-mstackrealign" ]
@@ skipping 102 matching lines @@
       # ld linker is used for mips Android, and ld does not accept library
       # absolute path prefixed by "-l"; Since libgcc does not exist in mips
       # sysroot the proper library will be linked.
       # TODO(gordanac): Remove once gold linker is used for mips Android.
       "gcc",
     ]
   } else {
     libs += [
       # Manually link the libgcc.a that the cross compiler uses. This is
       # absolute because the linker will look inside the sysroot if it's not.
+      # Passing via -l (as is done in libs) works only with gold, and not with
+      # the system linker.
       rebase_path(android_libgcc_file),
     ]
   }
 
   libs += [
     "c",
     "dl",
     "m",
   ]
 
@@ skipping 54 matching lines @@
 
     # Avoid errors with current NDK:
     # "third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/include/arm_neon.h:3426:3: error: argument must be a constant"
     "-finstrument-functions-exclude-file-list=arm_neon.h,SaturatedArithmeticARM.h",
   ]
   defines = [ "CYGPROFILE_INSTRUMENTATION=1" ]
 }
 
 config("no_cygprofile_instrumentation") {
 }