Revert of Use --icf=all instead of --icf=safe

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")
 import("//build/config/chrome_build.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
 if (current_cpu == "mipsel" || current_cpu == "mips64el") {
@@ skipping 398 matching lines @@
                             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",
 
       # TODO(brettw) common.gypi has this only for target toolset.
-      "-Wl,--icf=all",
+      "-Wl,--icf=safe",
 
       # 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",
@@ skipping 76 matching lines @@
       "-Wl,--exclude-libs=libc++_static.a",
 
       # Don't allow visible symbols from libraries that contain
       # assembly code with symbols that aren't hidden properly.
       # http://crbug.com/448386
       "-Wl,--exclude-libs=libvpx_assembly_arm.a",
     ]
     if (current_cpu == "arm") {
       ldflags += [
         # Enable identical code folding to reduce size.
-        "-Wl,--icf=all",
+        "-Wl,--icf=safe",
       ]
     }
 
     if (is_clang) {
       if (current_cpu == "arm") {
         cflags += [ "-target arm-linux-androideabi" ]
         ldflags += [ "-target arm-linux-androideabi" ]
       } else if (current_cpu == "x86") {
         cflags += [ "-target x86-linux-androideabi" ]
         ldflags += [ "-target x86-linux-androideabi" ]
@@ skipping 616 matching lines @@
       cflags += [ "-gsplit-dwarf" ]
     }
   }
 }
 
 config("no_symbols") {
   if (!is_win) {
     cflags = [ "-g0" ]
   }
 }