[turbofan] Improve testability of the InstructionSelector.

test/cctest/cctest.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 153 matching lines @@
         'test-utils.cc',
         'test-version.cc',
         'test-weakmaps.cc',
         'test-weaksets.cc',
         'test-weaktypedarrays.cc',
         'trace-extension.cc'
       ],
       'conditions': [
         ['v8_target_arch=="ia32"', {
           'sources': [  ### gcmole(arch:ia32) ###
+            'compiler/test-instruction-selector-ia32.cc',
             'test-assembler-ia32.cc',
             'test-code-stubs.cc',
             'test-code-stubs-ia32.cc',
             'test-cpu-ia32.cc',
             'test-disasm-ia32.cc',
             'test-macro-assembler-ia32.cc',
             'test-log-stack-tracer.cc'
           ],
         }],
         ['v8_target_arch=="x64"', {
@@ skipping 128 matching lines @@
             '<@(_outputs)',
             'TEST',  # type
             'off',  # compression
             '<@(file_list)',
           ],
         }
       ],
     },
   ],
 }