[wasm] Add UTF-8 validation

src/v8.gyp

 # Copyright 2012 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 1130 matching lines @@
         'wasm/ast-decoder.cc',
         'wasm/ast-decoder.h',
         'wasm/decoder.h',
         'wasm/encoder.cc',
         'wasm/encoder.h',
         'wasm/leb-helper.h',
         'wasm/module-decoder.cc',
         'wasm/module-decoder.h',
         'wasm/switch-logic.h',
         'wasm/switch-logic.cc',
+        'wasm/utf8.cc',
+        'wasm/utf8.h',
         'wasm/wasm-external-refs.cc',
         'wasm/wasm-external-refs.h',
         'wasm/wasm-function-name-table.cc',
         'wasm/wasm-function-name-table.h',
         'wasm/wasm-js.cc',
         'wasm/wasm-js.h',
         'wasm/wasm-macro-gen.h',
         'wasm/wasm-module.cc',
         'wasm/wasm-module.h',
         'wasm/wasm-opcodes.cc',
@@ skipping 1073 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }