Roll GN: gn format is --in-place by default

gn/BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
   ar = "ar"
   cc = "cc"
   cxx = "c++"
 }
@@ skipping 36 matching lines @@
 }
 
 config("executable") {
   if (is_mac) {
     ldflags = [ "-Wl,-rpath,@loader_path/." ]
   } else if (is_linux) {
     ldflags = [ "-Wl,-rpath,\$ORIGIN" ]
   }
 }
 
+pool("link_pool") {
+  depth = 0  #unlimited
+}
+
 toolchain("gcc_like") {
   lib_switch = "-l"
   lib_dir_switch = "-L"
 
   tool("cc") {
     depfile = "{{output}}.d"
     command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
     depsformat = "gcc"
     outputs = [
       "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
@@ skipping 39 matching lines @@
       rpath = "-Wl,-install_name,@rpath/$soname"
     }
 
     command = "$cxx -shared {{ldflags}} {{inputs}} {{solibs}} {{libs}} $rpath -o {{output}}"
     outputs = [
       "{{root_out_dir}}/$soname",
     ]
     output_prefix = "lib"
     default_output_extension = ".so"
     description = "$cxx -shared ... -o {{output}}"
+    pool = ":link_pool"
   }
 
   tool("link") {
     command = "$cxx {{ldflags}} {{inputs}} {{solibs}} {{libs}} -o {{output}}"
     outputs = [
       "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
     ]
     description = "$cxx ... -o {{output}}"
+    pool = ":link_pool"
   }
 
   tool("stamp") {
     command = "touch {{output}}"
   }
 
   tool("copy") {
     command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
   }
 }