MIPS: Add turbofan support for mips32.

src/compiler/compiler.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'v8_code': 1,
   },
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
@@ skipping 36 matching lines @@
         ['v8_target_arch=="ia32"', {
           'sources': [  ### gcmole(arch:ia32) ###
             'ia32/instruction-selector-ia32-unittest.cc',
           ],
         }],
         ['v8_target_arch=="x64"', {
           'sources': [  ### gcmole(arch:x64) ###
             'x64/instruction-selector-x64-unittest.cc',
           ],
         }],
+        ['v8_target_arch=="mipsel"', {
+          'sources': [  ### gcmole(arch:mipsel) ###
+            'mips/instruction-selector-mips-unittest.cc',
+          ],
+        }],
       ],
     },
   ],
 }