Extract Signature from src/compiler/machine-type.h to src/signature.h

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/mips.gni")
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
@@ skipping 959 matching lines @@
     "src/sampler.cc",
     "src/sampler.h",
     "src/scanner-character-streams.cc",
     "src/scanner-character-streams.h",
     "src/scanner.cc",
     "src/scanner.h",
     "src/scopeinfo.cc",
     "src/scopeinfo.h",
     "src/scopes.cc",
     "src/scopes.h",
+    "src/signature.h",
     "src/small-pointer-list.h",
     "src/smart-pointers.h",
     "src/snapshot/natives.h",
     "src/snapshot/serialize.cc",
     "src/snapshot/serialize.h",
     "src/snapshot/snapshot-common.cc",
     "src/snapshot/snapshot-source-sink.cc",
     "src/snapshot/snapshot-source-sink.h",
     "src/snapshot/snapshot.h",
     "src/string-builder.cc",
@@ skipping 616 matching lines @@
       sources += [
         "src/d8-debug.cc",
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }