[wasm][asm.js] Adding custom asm.js lexer.

test/cctest/BUILD.gn

 # Copyright 2016 The V8 project 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("../../gni/v8.gni")
 
 v8_executable("cctest") {
   testonly = true
 
   sources = [
     "$target_gen_dir/resources.cc",
 
     ### gcmole(all) ###
+    "asmjs/test-asm-lexer.cc",
     "asmjs/test-asm-typer.cc",
     "ast-types-fuzz.h",
     "cctest.cc",
     "cctest.h",
     "compiler/c-signature.h",
     "compiler/call-tester.h",
     "compiler/code-assembler-tester.h",
     "compiler/codegen-tester.cc",
     "compiler/codegen-tester.h",
     "compiler/function-tester.cc",
@@ skipping 409 matching lines @@
   ]
 
   deps = [
     "../..:v8",
     "../..:v8_libbase",
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
 }