[turbofan] Turn IrOpcode::Mnemonic() into a table lookup.

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 472 matching lines @@
         '../../src/compiler/move-optimizer.h',
         '../../src/compiler/node-aux-data-inl.h',
         '../../src/compiler/node-aux-data.h',
         '../../src/compiler/node-cache.cc',
         '../../src/compiler/node-cache.h',
         '../../src/compiler/node-matchers.h',
         '../../src/compiler/node-properties-inl.h',
         '../../src/compiler/node-properties.h',
         '../../src/compiler/node.cc',
         '../../src/compiler/node.h',
+        '../../src/compiler/opcodes.cc',
         '../../src/compiler/opcodes.h',
         '../../src/compiler/operator-properties.cc',
         '../../src/compiler/operator-properties.h',
         '../../src/compiler/operator.cc',
         '../../src/compiler/operator.h',
         '../../src/compiler/pipeline.cc',
         '../../src/compiler/pipeline.h',
         '../../src/compiler/pipeline-statistics.cc',
         '../../src/compiler/pipeline-statistics.h',
         '../../src/compiler/raw-machine-assembler.cc',
@@ skipping 1247 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }