Use --icf=all for Linux64 too.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 52a633f4148d5f0ea01fbd67ec807674833624ed..b0b90e029c0217c309376c1fe61ec90d079a2ecd 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -689,6 +689,9 @@
       '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,
 
@@ -1224,6 +1227,7 @@
     'gomadir%': '<(gomadir)',
     'use_lto%': '<(use_lto)',
     'use_lto_o2%': '<(use_lto_o2)',
+    'gold_icf_level%': '<(gold_icf_level)',
     'video_hole%': '<(video_hole)',
     'v8_use_external_startup_data%': '<(v8_use_external_startup_data)',
     'cfi_vptr%': '<(cfi_vptr)',
@@ -2205,19 +2209,6 @@
         'use_sanitizer_options%': 1,
       }],
 
-      # Allowed level of identical code folding in the gold linker.
-      ['OS=="linux" and target_arch=="x64"', {
-        # --icf=safe disables much more folding on x86_64 than elsewhere, see
-        # http://crbug.com/492177.  Turning it on saves over 12 MB of binary
-        # size, but it seems to regress cold startup time by over a second
-        # (see http://crbug.com/492809).
-        # TODO(thakis): Check if disabling ICF would inmprove android cold start
-        # times by several seconds too.
-        'gold_icf_level%': 'safe',
-      }, {
-        'gold_icf_level%': 'all',
-      }],
-
       ['OS=="linux" and asan==0 and msan==0 and lsan==0 and tsan==0', {
         # PNaCl toolchain Non-SFI build only supports linux OS build.
         # Also, it does not support sanitizers.