MIPS64: Add support for architecture revision 6.

build/toolchain.gypi

 # Copyright 2013 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 358 matching lines @@
                 'cflags': ['-EL'],
                 'ldflags': ['-EL'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
+                  ['mips_arch_variant=="r6"', {
+                    'cflags': ['-mips64r6', '-mabi=64', '-Wa,-mips64r6'],
+                    'ldflags': [
+                      '-mips64r6', '-mabi=64',
+                      '-Wl,--dynamic-linker=$(LDSO_PATH)',
+                      '-Wl,--rpath=$(LD_R_PATH)',
+                    ],
+                  }],
                   ['mips_arch_variant=="r2"', {
                     'cflags': ['-mips64r2', '-mabi=64', '-Wa,-mips64r2'],
                     'ldflags': [
                       '-mips64r2', '-mabi=64',
                       '-Wl,--dynamic-linker=$(LDSO_PATH)',
                       '-Wl,--rpath=$(LD_R_PATH)',
                     ],
                   }],
                   ['mips_arch_variant=="loongson"', {
                     'cflags': ['-mips3', '-Wa,-mips3'],
@@ skipping 10 matching lines @@
           [ 'v8_use_mips_abi_hardfloat=="true"', {
             'defines': [
               '__mips_hard_float=1',
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }, {
             'defines': [
               '__mips_soft_float=1'
             ],
           }],
+          ['mips_arch_variant=="r6"', {
+            'defines': ['_MIPS_ARCH_MIPS64R6',],
+          }],
           ['mips_arch_variant=="r2"', {
             'defines': ['_MIPS_ARCH_MIPS64R2',],
           }],
           ['mips_arch_variant=="loongson"', {
             'defines': ['_MIPS_ARCH_LOONGSON',],
           }],
         ],
       }],  # v8_target_arch=="mips64el"
       ['v8_target_arch=="x64"', {
         'defines': [
@@ skipping 406 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }