[gn] Use PIE in v8 executables

gni/v8.gni

 # Copyright 2016 the V8 project 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/v8_target_cpu.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 declare_args() {
   # Indicate if valgrind was fetched as a custom deps to make it available on
   # swarming.
@@ skipping 61 matching lines @@
     configs += add_configs
   }
 }
 
 template("v8_executable") {
   executable(target_name) {
     forward_variables_from(invoker, "*", [ "configs" ])
     configs += invoker.configs
     configs -= remove_configs
     configs += add_configs
+    if (is_linux) {
+      # For enabling ASLR.
+      ldflags = [ "-pie" ]
+    }
   }
 }
 
 template("v8_component") {
   component(target_name) {
     forward_variables_from(invoker, "*", [ "configs" ])
     configs += invoker.configs
     configs -= remove_configs
     configs += add_configs
   }
 }