Make /fastlink builds as optimized as non-/fastlink builds

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")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 1551 matching lines @@
     asmflags = cflags
     ldflags = []
   }
 }
 
 # Minimal symbols.
 config("minimal_symbols") {
   if (is_win) {
     # Linker symbols for backtraces only.
     cflags = []
-    if (is_win_fastlink) {
-      # Tell VS 2015+ to create a PDB that references debug
-      # information in .obj and .lib files instead of copying
-      # it all. This flag is incompatible with /PROFILE
-      ldflags = [ "/DEBUG:FASTLINK" ]
-    } else {
-      ldflags = [ "/DEBUG" ]
-    }
+    ldflags = [ "/DEBUG" ]
   } else {
     if (is_android) {
       # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3
       # explicitly on android where we are hitting https://crbug.com/638485.
       # The arguments MUST be in this order because of a gcc arg parsing bug.
       cflags = [
         "-gdwarf-3",
         "-g1",
       ]
     } else {
@@ skipping 30 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }