[Interpreter] Add support for short (16 bit) operands.

tools/gyp/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 804 matching lines @@
         '../../src/ic/ic.cc',
         '../../src/ic/ic.h',
         '../../src/ic/ic-compiler.cc',
         '../../src/ic/ic-compiler.h',
         '../../src/identity-map.cc',
         '../../src/identity-map.h',
         '../../src/interface-descriptors.cc',
         '../../src/interface-descriptors.h',
         '../../src/interpreter/bytecodes.cc',
         '../../src/interpreter/bytecodes.h',
-        '../../src/interpreter/bytecode-generator.cc',
-        '../../src/interpreter/bytecode-generator.h',
         '../../src/interpreter/bytecode-array-builder.cc',
         '../../src/interpreter/bytecode-array-builder.h',
         '../../src/interpreter/bytecode-array-iterator.cc',
         '../../src/interpreter/bytecode-array-iterator.h',
+        '../../src/interpreter/bytecode-generator.cc',
+        '../../src/interpreter/bytecode-generator.h',
+        '../../src/interpreter/bytecode-traits.h',
         '../../src/interpreter/interpreter.cc',
         '../../src/interpreter/interpreter.h',
         '../../src/isolate-inl.h',
         '../../src/isolate.cc',
         '../../src/isolate.h',
         '../../src/json-parser.h',
         '../../src/json-stringifier.h',
         '../../src/layout-descriptor-inl.h',
         '../../src/layout-descriptor.cc',
         '../../src/layout-descriptor.h',
@@ skipping 1244 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }