[gn] Don't use PIE for host executables

Using PIE switches on ASLR. With mksnapshot, this can lead
to non-deterministic snapshots.

BUG=v8:5233

Review-Url: https://codereview.chromium.org/2179303003
Cr-Commit-Position: refs/heads/master@{#38084}

BUILD.gn

@@ -2181,6 +2181,9 @@ if (current_toolchain == v8_snapshot_toolchain) {
   v8_executable("mksnapshot") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
+    # This is executed on the host only and doesn't require PIE.
+    want_pie = false
+
     sources = [
       "src/snapshot/mksnapshot.cc",
     ]
@@ -2203,6 +2206,9 @@ v8_executable("mkpeephole") {
   # bytecodes that are described in bytecodes.{cc,h}.
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
+  # This is executed on the host only and doesn't require PIE.
+  want_pie = false
+
   sources = [
     "src/interpreter/bytecode-peephole-optimizer.h",
     "src/interpreter/bytecodes.cc",

gni/v8.gni

@@ -87,13 +87,19 @@ template("v8_source_set") {
 
 template("v8_executable") {
   executable(target_name) {
-    forward_variables_from(invoker, "*", [ "configs" ])
+    forward_variables_from(invoker, "*", [ "configs", "want_pie"])
     configs += invoker.configs
     configs -= v8_remove_configs
     configs += v8_add_configs
-    if (is_linux) {
-      # For enabling ASLR.
-      ldflags = [ "-pie" ]
+    if (!defined(invoker.want_pie) || invoker.want_pie) {
+      if (is_linux) {
+        # For enabling ASLR.
+        ldflags = [ "-pie" ]
+      }
+    } else {
+      if (is_android) {
+        configs -= "//build/config/android:executable_config"
+      }
     }
   }
 }