build: remove native mksnapshot for arm/arm64 (#17561)

* build: remove native mksnapshot for arm/arm64

patches/common/v8/.patches

@@ -2,7 +2,5 @@ deps_backport_detailed_line_info_for_cpu_profiler.patch
 add_realloc.patch
 build_gn.patch
 expose_mksnapshot.patch
-build-torque-with-x64-toolchain-on-arm.patch
-do_not_run_arm_arm64_mksnapshot_binaries.patch
 deps_provide_more_v8_backwards_compatibility.patch
 dcheck.patch

patches/common/v8/build-torque-with-x64-toolchain-on-arm.patch

@@ -1,31 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: deepak1556 <hop2deep@gmail.com>
-Date: Thu, 21 Feb 2019 00:06:32 +0530
-Subject: build-torque-with-x64-toolchain-on-arm.patch
-
-torque binary has to be run during the build.
-
-diff --git a/BUILD.gn b/BUILD.gn
-index d3dbe37d0a145921dddaea72e394c87826d6d5fe..61f952f1a577b17c6063996fd1e17a195714bf5a 100644
---- a/BUILD.gn
-+++ b/BUILD.gn
-@@ -178,7 +178,9 @@ declare_args() {
- # the snapshot toolchain is the target toolchain and, hence, can't be used.
- v8_generator_toolchain = v8_snapshot_toolchain
- if (host_cpu == "x64" &&
--    (v8_current_cpu == "mips" || v8_current_cpu == "mips64")) {
-+    (v8_current_cpu == "mips" || v8_current_cpu == "mips64" ||
-+     v8_snapshot_toolchain == "//build/toolchain/linux:clang_arm" ||
-+     v8_snapshot_toolchain == "//build/toolchain/linux:clang_arm64")) {
-   v8_generator_toolchain = "//build/toolchain/linux:clang_x64"
- }
- 
-@@ -3545,7 +3547,7 @@ if (v8_use_snapshot && current_toolchain == v8_snapshot_toolchain) {
-   }
- }
- 
--if (current_toolchain == v8_snapshot_toolchain) {
-+if (current_toolchain == v8_generator_toolchain) {
-   v8_executable("torque") {
-     visibility = [ ":*" ]  # Only targets in this file can depend on this.
- 

patches/common/v8/do_not_run_arm_arm64_mksnapshot_binaries.patch

@@ -1,36 +0,0 @@
-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 61f952f1a577b17c6063996fd1e17a195714bf5a..2a1c7d0348ace504c9b26850de7340d981cbb440 100644
---- a/BUILD.gn
-+++ b/BUILD.gn
-@@ -1322,9 +1322,19 @@ 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" ]
-     }

patches/common/v8/expose_mksnapshot.patch

@@ -3,7 +3,7 @@ From: Shelley Vohr <shelley.vohr@gmail.com>
 Date: Mon, 22 Oct 2018 10:47:13 -0700
 Subject: expose_mksnapshot.patch
 
-Needed in order to build mksnapshot on arm.
+Needed in order to target mksnapshot for mksnapshot zip.
 
 diff --git a/BUILD.gn b/BUILD.gn
 index d8a2b8e11a3e0e9820dca061a00dbf1a6859bcf4..d3dbe37d0a145921dddaea72e394c87826d6d5fe 100644