Enable /GL for all targets in Official (behind a flag)

third_party/yasm/BUILD.gn

 # Copyright 2014 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.
 
 # The yasm build process creates a slew of small C subprograms that
 # dynamically generate files at various point in the build process.  This makes
 # the build integration moderately complex.
 #
 # There are three classes of dynamically generated files:
 #   1) C source files that should be included in the build (eg., lc3bid.c)
@@ skipping 279 matching lines @@
     configs += [
       ":yasm_config",
       "//build/config/compiler:no_chromium_code",
       "//build/config/compiler:no_incompatible_pointer_warnings",
 
       # Must be after no_chromium_code for warning flags to be ordered
       # correctly.
       ":yasm_warnings",
     ]
 
+    # Disable the WPO for yasm: crbug.com/604808

[brucedawson, 2016/04/29 00:06:13]

the WPO -> WPO

[Sébastien Marchand, 2016/04/29 14:15:39]

Done.

+    if (is_official_build && full_wpo_on_official) {
+      configs -= [ "//build/config/compiler:default_optimization" ]
+      configs += [ "//build/config/compiler:optimize_no_wpo" ]
+    }
+
     # Yasm generates a bunch of .c files which its source file #include.
     # Add the |target_gen_dir| into the include path so it can find them.
     # Ideally, these generated .c files would be placed into a separate
     # directory, but the gen_x86_insn.py script does not make this easy.
     include_dirs = [ yasm_gen_include_dir ]
 
     if (!is_win) {
       cflags = [
         "-std=c89",
         "-pedantic",
@@ skipping 215 matching lines @@
 
     # Output eventually #included by source/patched-yasm/frontends/yasm/x86id.c
     outputs = [
       "$yasm_gen_include_dir/x86insns.c",
       "$yasm_gen_include_dir/x86insn_gas.gperf",
       "$yasm_gen_include_dir/x86insn_nasm.gperf",
     ]
     args = [ rebase_path(yasm_gen_include_dir, root_build_dir) ]
   }
 }