Linux: Turn --icf=safe back on for the gold linker. (try 2)

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 4296 matching lines @@
                   # '-Wl,--threads',
                   # '-Wl,--thread-count=4',
                 ],
               }],
             ],
             'conditions': [
               ['release_valgrind_build==0', {
                 'target_conditions': [
                   ['_toolset=="target"', {
                     'ldflags': [
-                      # There seems to be a conflict of --icf and -pie
-                      # in gold which can generate crashy binaries. As
-                      # a security measure, -pie takes precedence for
-                      # now.
-                      #'-Wl,--icf=safe',
-                      '-Wl,--icf=none',
+                      '-Wl,--icf=safe',
                     ],
                   }],
                 ],
               }],
             ],
           }],
           ['linux_use_bundled_binutils==1', {
             'cflags': [
               '-B<!(cd <(DEPTH) && pwd -P)/<(binutils_dir)',
             ],
@@ skipping 1445 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }