linux: Always use (64bit) gold for linking, even on 32bit.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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")
 if (cpu_arch == "arm") {
   import("//build/config/arm.gni")
 }
 if (is_posix) {
   import("//build/config/gcc/gcc_version.gni")
 }
 
 declare_args() {
   # Normally, Android builds are lightly optimized, even for debug builds, to
   # keep binary size down. Setting this flag to true disables such optimization
   android_full_debug = false
 }
 
-use_gold = is_linux && cpu_arch == "x64"
+use_gold = is_linux
 
 # linux_use_debug_fission: whether to use split DWARF debug info
 # files. This can reduce link time significantly, but is incompatible
 # with some utilities such as icecc and ccache. Requires gold and
 # gcc >= 4.8 or clang.
 # http://gcc.gnu.org/wiki/DebugFission
 #
 # TODO(GYP) enable this. Currently this gives errors from objcopy, presumably
 # because some other symbol or toolchain setting isn't correct.
 #use_debug_fission = use_gold
@@ skipping 163 matching lines @@
 
   # Linux-specific compiler flags setup.
   # ------------------------------------
   if (is_linux) {
     cflags += [ "-pthread" ]
     ldflags += [
       "-pthread",
     ]
   }
   if (use_gold) {
-    # Use gold for linking on 64-bit Linux only (on 32-bit it runs out of
-    # address space, and it doesn't support cross-compiling).
+    # 32-bit hosts have to be 32-bit userland with a 64-bit kernel, so that
+    # 64-bit gold gets used. 32-bit gold will run out of address space.
     gold_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin",
                             root_build_dir)
     ldflags += [
       "-B$gold_path",
 
       # Newer gccs and clangs support -fuse-ld, use the flag to force gold
       # selection.
       # gcc -- http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Optimize-Options.html
       "-fuse-ld=gold",
 
@@ skipping 693 matching lines @@
       cflags += [ "-gsplit-dwarf" ]
     }
   }
 }
 
 config("no_symbols") {
   if (!is_win) {
     cflags = [ "-g0" ]
   }
 }