get_concurrent_links.py: give more RAM per job in LTO builds.

build/toolchain/win/BUILD.gn

Index: build/toolchain/win/BUILD.gn
diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index 2054713be6c5b90c75f3d854bc092ee53dff060b..11f9328c5115541356b71297e8b4152368ef4b4d 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/goma.gni")
 import("//build/toolchain/toolchain.gni")
@@ -24,7 +25,12 @@ if (use_goma) {
 }
 
 # This value will be inherited in the toolchain below.
-concurrent_links = exec_script("../get_concurrent_links.py", [], "value")
+if (is_cfi) {
+  concurrent_links =
+      exec_script("../get_concurrent_links.py", [ "--lto" ], "value")
+} else {
+  concurrent_links = exec_script("../get_concurrent_links.py", [], "value")
+}
 
 # Copy the VS runtime DLL for the default toolchain to the root build directory
 # so things will run.