do_not_run_arm_arm64_mksnapshot_binaries.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: John Kleinschmidt <jkleinsc@github.com>
Date: Mon, 19 Nov 2018 18:33:56 -0500
Subject: Do not run arm/arm64 mksnapshot binaries

For arm and arm64 target_arches, Chromium builds mksnapshot as an x64 binary and
as part of that build mksnapshot is executed to produce snapshot_blob.bin.  
Chromium does not build native arm and arm64 binaries of mksnapshot, but 
Electron does, so this patch makes sure that the build doesn't try to run 
the mksnapshot binary if it was built for arm or arm64.

diff --git a/BUILD.gn b/BUILD.gn
index b1194e4b828e66d8d09fac57481efe313031f3ac..c256945650c24324c28a2e17fb299a1d0c2dcd19 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1247,9 +1247,19 @@ if (v8_use_snapshot && v8_use_external_startup_data) {
     ]
     public_deps = [
       ":natives_blob",
-      ":run_mksnapshot_default",
     ]
 
+    if (v8_snapshot_toolchain == "//build/toolchain/linux:clang_arm" ||
+        v8_snapshot_toolchain == "//build/toolchain/linux:clang_arm64") {
+      public_deps += [
+        ":mksnapshot($v8_snapshot_toolchain)",
+      ]
+    } else {
+      public_deps += [
+        ":run_mksnapshot_default",
+      ]
+    }
+
     if (v8_use_multi_snapshots) {
       public_deps += [ ":run_mksnapshot_trusted" ]
     }