Extend GCMole to cover ARM64 architecture.

tools/gcmole/gcmole.lua

 -- Copyright 2011 the V8 project authors. All rights reserved.
 -- Redistribution and use in source and binary forms, with or without
 -- modification, are permitted provided that the following conditions are
 -- met:
 --
 --     * Redistributions of source code must retain the above copyright
 --       notice, this list of conditions and the following disclaimer.
 --     * Redistributions in binary form must reproduce the above
 --       copyright notice, this list of conditions and the following
 --       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
       if FLAGS[flag] ~= nil then
          FLAGS[flag] = (no ~= "no")
       else
          error("Unknown flag: " .. flag)
       end
    else
       table.insert(ARGS, arg[i])
    end
 end
 
-local ARCHS = ARGS[1] and { ARGS[1] } or { 'ia32', 'arm', 'x64' }
+local ARCHS = ARGS[1] and { ARGS[1] } or { 'ia32', 'arm', 'x64', 'arm64' }
 
 local io = require "io"
 local os = require "os"
 
 function log(...)
    io.stderr:write(string.format(...))
    io.stderr:write "\n"
 end
 
 -------------------------------------------------------------------------------
@@ skipping 109 matching lines @@
    for k, v in pairs(t) do e[k] = v end
    return config(e)
 end
 
 local ARCHITECTURES = {
    ia32 = config { triple = "i586-unknown-linux",
                    arch_define = "V8_TARGET_ARCH_IA32" },
    arm = config { triple = "i586-unknown-linux",
                   arch_define = "V8_TARGET_ARCH_ARM" },
    x64 = config { triple = "x86_64-unknown-linux",
-                  arch_define = "V8_TARGET_ARCH_X64" }
+                  arch_define = "V8_TARGET_ARCH_X64" },
+   arm64 = config { triple = "x86_64-unknown-linux",
+                    arch_define = "V8_TARGET_ARCH_ARM64" },
 }
 
 -------------------------------------------------------------------------------
 -- GCSuspects Generation
 
 local gc, gc_caused, funcs
 
 local WHITELIST = {
    -- The following functions call CEntryStub which is always present.
    "MacroAssembler.*CallExternalReference",
@@ skipping 165 matching lines @@
 
 for _, arch in ipairs(ARCHS) do
    if not ARCHITECTURES[arch] then
       error ("Unknown arch: " .. arch)
    end
 
    errors = SafeCheckCorrectnessForArch(arch, report) or errors
 end
 
 os.exit(errors and 1 or 0)