MIPS: fix mips_arch_variant bug in GYP build.

build/common.gypi

 # 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 192 matching lines @@
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
                   ['mips_arch_variant=="mips32r2"', {
                     'cflags': ['-mips32r2', '-Wa,-mips32r2'],
                   }],
+                  ['mips_arch_variant=="mips32r1"', {
+                    'cflags': ['-mips32', '-Wa,-mips32'],
+                 }],
                   ['mips_arch_variant=="loongson"', {
                     'cflags': ['-mips3', '-Wa,-mips3'],
-                  }, {
-                    'cflags': ['-mips32', '-Wa,-mips32'],
                   }],
                 ],
               }],
             ],
           }],
           [ 'v8_can_use_fpu_instructions=="true"', {
             'defines': [
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }],
@@ skipping 215 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }