S390: [gn] define V8_TARGET_ARCH_S390_LE_SIM for s390 sim build

BUILD.gn

 # Copyright 2014 The Chromium 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/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 243 matching lines @@
       ]
     } else {
       defines += [ "__mips_soft_float=1" ]
     }
     if (mips_arch_variant == "r6") {
       defines += [ "_MIPS_ARCH_MIPS64R6" ]
     } else if (mips_arch_variant == "r2") {
       defines += [ "_MIPS_ARCH_MIPS64R2" ]
     }
   }
-  if (v8_target_arch == "s390") {
+  if (v8_target_arch == "s390" || v8_target_arch == "s390x") {
     defines += [ "V8_TARGET_ARCH_S390" ]
-  }
-  if (v8_target_arch == "s390x") {
-    defines += [
-      "V8_TARGET_ARCH_S390",
-      "V8_TARGET_ARCH_S390X",
-    ]
+    if (v8_target_arch == "s390x") {
+      defines += [ "V8_TARGET_ARCH_S390X" ]
+    }
+    if (host_cpu == "x64" || host_cpu == "x86") {
+      defines += [ "V8_TARGET_ARCH_S390_LE_SIM" ]
+    }
   }
   if (v8_target_arch == "x86") {
     defines += [ "V8_TARGET_ARCH_IA32" ]
   }
   if (v8_target_arch == "x64") {
     defines += [ "V8_TARGET_ARCH_X64" ]
   }
 
   if (is_win) {
     defines += [ "WIN32" ]
@@ skipping 2011 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }