includes: move Label out of assembler.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/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 1516 matching lines @@
     "src/interpreter/interpreter.h",
     "src/isolate-inl.h",
     "src/isolate.cc",
     "src/isolate.h",
     "src/json-parser.cc",
     "src/json-parser.h",
     "src/json-stringifier.cc",
     "src/json-stringifier.h",
     "src/keys.cc",
     "src/keys.h",
+    "src/label.h",
     "src/layout-descriptor-inl.h",
     "src/layout-descriptor.cc",
     "src/layout-descriptor.h",
     "src/list-inl.h",
     "src/list.h",
     "src/locked-queue-inl.h",
     "src/locked-queue.h",
     "src/log-inl.h",
     "src/log-utils.cc",
     "src/log-utils.h",
@@ skipping 1512 matching lines @@
   ]
 
   configs = [
     ":external_config",
     ":internal_config_base",
   ]
 }
 
 v8_fuzzer("wasm_data_section_fuzzer") {
 }