Use gold and the bundled binutils on x86 by default

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index ef9ecb71cc91850f0f4a756a8c9c5753a0fdc1cf..bae43e1046742c0964eb51b7101cb876731b598c 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -689,9 +689,6 @@
       'use_lto%': 0,
       'use_lto_o2%': 0,
 
-      # Allowed level of identical code folding in the gold linker.
-      'gold_icf_level%': 'all',
-
       # Libxkbcommon usage.
       'use_xkbcommon%': 0,
 
@@ -917,14 +914,20 @@
         # linux_use_bundled_gold: whether to use the gold linker binary checked
         # into third_party/binutils.  Force this off via GYP_DEFINES when you
         # are using a custom toolchain and need to control -B in ldflags.
-        # Do not use 32-bit gold on 32-bit hosts as it runs out address space
-        # for component=static_library builds.

[Nico, 2016/05/05 16:25:21]

This comment is obsolete, we switched to 64-bit host gold always quite a long
time ago.

-        ['(OS=="linux" or OS=="android") and (target_arch=="x64" or target_arch=="arm" or (target_arch=="ia32" and host_arch=="x64"))', {
+        ['(OS=="linux" or OS=="android") and (target_arch=="x64" or target_arch=="arm" or target_arch=="ia32")', {
           'linux_use_bundled_gold%': 1,
         }, {
           'linux_use_bundled_gold%': 0,
         }],
 
+        # Allowed level of identical code folding in the gold linker.
+        # icf=all is buggy on ia32, so disabled by default.

[Nico, 2016/05/05 16:25:21]

Where is this from? I can't see evidence of this, and it's new from what I can
tell.

+        ['(OS=="linux" and (target_arch=="ia32"))', {
+          'gold_icf_level%': 'none',
+        }, {
+          'gold_icf_level%': 'all',
+        }],
+
         # linux_use_bundled_binutils: whether to use the binary binutils
         # checked into third_party/binutils.  These are not multi-arch so cannot
         # be used except on x86 and x86-64 (the only two architectures which
@@ -937,8 +940,7 @@
         }],
 
         # linux_use_gold_flags: whether to use build flags that rely on gold.
-        # On by default for x64 Linux.
-        ['OS=="linux" and target_arch=="x64"', {
+        ['OS=="linux" and (target_arch=="x64" or target_arch=="ia32" or target_arch=="arm")', {
           'linux_use_gold_flags%': 1,
         }, {
           'linux_use_gold_flags%': 0,