deps: cherry-pick abab9fb from V8 upstream

Original commit message:
  s390, ppc64: Enable v8gen.py on Linux s390, ppc64

  Change-Id: Ia05e949e1a823e30a45894c47f6f6df2e159befe
  Reviewed-on: https://chromium-review.googlesource.com/1135540
  Commit-Queue: Michael Achenbach <machenbach@chromium.org>
  Reviewed-by: Michael Achenbach <machenbach@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#54485}

PR-URL: #23695
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yang Guo <yangguo@chromium.org>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>

common.gypi

@@ -33,7 +33,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.39',
+    'v8_embedder_string': '-node.40',
 
     # Enable disassembler for `--print-code` v8 options
     'v8_enable_disassembler': 1,

deps/v8/infra/mb/mb_config.pyl

@@ -27,18 +27,27 @@
       'mips64el.debug': 'default_debug_mips64el',
       'mips64el.optdebug': 'default_optdebug_mips64el',
       'mips64el.release': 'default_release_mips64el',
+      'ppc.debug': 'default_debug_ppc',
+      'ppc.optdebug': 'default_optdebug_ppc',
+      'ppc.release': 'default_release_ppc',
       'ppc.debug.sim': 'default_debug_ppc_sim',
       'ppc.optdebug.sim': 'default_optdebug_ppc_sim',
       'ppc.release.sim': 'default_release_ppc_sim',
       'ppc64.debug': 'default_debug_ppc64',
-      'ppc64.debug.sim': 'default_debug_ppc64_sim',
       'ppc64.optdebug': 'default_optdebug_ppc64',
-      'ppc64.optdebug.sim': 'default_optdebug_ppc64_sim',
       'ppc64.release': 'default_release_ppc64',
+      'ppc64.debug.sim': 'default_debug_ppc64_sim',
+      'ppc64.optdebug.sim': 'default_optdebug_ppc64_sim',
       'ppc64.release.sim': 'default_release_ppc64_sim',
+      's390.debug': 'default_debug_s390',
+      's390.optdebug': 'default_optdebug_s390',
+      's390.release': 'default_release_s390',
       's390.debug.sim': 'default_debug_s390_sim',
       's390.optdebug.sim': 'default_optdebug_s390_sim',
       's390.release.sim': 'default_release_s390_sim',
+      's390x.debug': 'default_debug_s390x',
+      's390x.optdebug': 'default_optdebug_s390x',
+      's390x.release': 'default_release_s390x',
       's390x.debug.sim': 'default_debug_s390x_sim',
       's390x.optdebug.sim': 'default_optdebug_s390x_sim',
       's390x.release.sim': 'default_release_s390x_sim',
@@ -255,7 +264,6 @@
 
   # To ease readability, config values are ordered by:
   # release/debug, arch type, other values alphabetically.
-  # TODO: create separate native configurations for ppc,s390[x].
   'configs': {
     # Developer default configs.
     'default_debug_arm': [
@@ -288,6 +296,12 @@
       'debug', 'simulate_mips64el', 'v8_enable_slow_dchecks'],
     'default_release_mips64el': [
       'release', 'simulate_mips64el'],
+    'default_debug_ppc': [
+      'debug', 'ppc', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_ppc': [
+      'debug', 'ppc', 'v8_enable_slow_dchecks'],
+    'default_release_ppc': [
+      'release', 'ppc'],
     'default_debug_ppc_sim': [
       'debug', 'simulate_ppc', 'v8_enable_slow_dchecks', 'v8_full_debug'],
     'default_optdebug_ppc_sim': [
@@ -296,22 +310,34 @@
       'release', 'simulate_ppc'],
     'default_debug_ppc64': [
       'debug', 'ppc64', 'gcc', 'v8_enable_slow_dchecks', 'v8_full_debug'],
-    'default_debug_ppc64_sim': [
-      'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks', 'v8_full_debug'],
     'default_optdebug_ppc64': [
       'debug', 'ppc64', 'gcc', 'v8_enable_slow_dchecks'],
-    'default_optdebug_ppc64_sim': [
-      'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks'],
     'default_release_ppc64': [
       'release', 'ppc64', 'gcc'],
+    'default_debug_ppc64_sim': [
+      'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_ppc64_sim': [
+      'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks'],
     'default_release_ppc64_sim': [
       'release', 'simulate_ppc64'],
+    'default_debug_s390': [
+      'debug', 's390', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_s390': [
+      'debug', 's390', 'v8_enable_slow_dchecks'],
+    'default_release_s390': [
+      'release', 's390'],
     'default_debug_s390_sim': [
       'debug', 'simulate_s390', 'v8_enable_slow_dchecks', 'v8_full_debug'],
     'default_optdebug_s390_sim': [
       'debug', 'simulate_s390', 'v8_enable_slow_dchecks'],
     'default_release_s390_sim': [
       'release', 'simulate_s390'],
+    'default_debug_s390x': [
+      'debug', 's390x', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_s390x': [
+      'debug', 's390x', 'v8_enable_slow_dchecks'],
+    'default_release_s390x': [
+      'release', 's390x'],
     'default_debug_s390x_sim': [
       'debug', 'simulate_s390x', 'v8_enable_slow_dchecks', 'v8_full_debug'],
     'default_optdebug_s390x_sim': [
@@ -826,6 +852,22 @@
       'gn_args': 'v8_enable_verify_csa=true',
     },
 
+    's390': {
+      'gn_args': 'target_cpu="s390x" v8_target_cpu="s390"',
+    },
+
+    's390x': {
+      'gn_args': 'target_cpu="s390x" v8_target_cpu="s390x"',
+    },
+
+    'ppc': {
+      'gn_args': 'target_cpu="ppc"',
+    },
+
+    'ppc64': {
+      'gn_args': 'target_cpu="ppc64" use_custom_libcxx=false',
+    },
+
     'x64': {
       'gn_args': 'target_cpu="x64"',
     },
@@ -834,8 +876,5 @@
       'gn_args': 'target_cpu="x86"',
     },
 
-    'ppc64': {
-      'gn_args': 'target_cpu="ppc64"',
-    },
   },
 }

deps/v8/tools/mb/mb.py

@@ -837,7 +837,13 @@ def GNCmd(self, subcommand, path, *args):
     else:
       subdir, exe = 'win', 'gn.exe'
 
-    gn_path = self.PathJoin(self.chromium_src_dir, 'buildtools', subdir, exe)
+    arch = platform.machine()
+    if (self.platform == 'linux2' and
+       (arch.startswith('s390') or arch.startswith('ppc'))):
+      # use gn in PATH
+      gn_path = 'gn'
+    else:
+      gn_path = self.PathJoin(self.chromium_src_dir, 'buildtools', subdir, exe)
     return [gn_path, subcommand, path] + list(args)