Make optimized debug builds link against debug CRT.

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 470 matching lines @@
               }],
               ['v8_optimized_debug==2', {
                 'Optimization': '2',
                 'InlineFunctionExpansion': '2',
                 'EnableIntrinsicFunctions': 'true',
                 'FavorSizeOrSpeed': '0',
                 'StringPooling': 'true',
                 'BasicRuntimeChecks': '0',
                 'conditions': [
                   ['component=="shared_library"', {
-                    'RuntimeLibrary': '2',  #/MD
+                    'RuntimeLibrary': '3',  #/MDd
                   }, {
-                    'RuntimeLibrary': '0',  #/MT
+                    'RuntimeLibrary': '1',  #/MTd
                   }],
                   ['v8_target_arch=="x64"', {
                     # TODO(2207): remove this option once the bug is fixed.
                     'WholeProgramOptimization': 'true',
                   }],
                 ],
               }],
             ],
           },
           'VCLinkerTool': {
@@ skipping 183 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }