Make enabling of CSA verifier a build-time flag

gypfiles/features.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 15 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 # Compile time controlled V8 features.
 
 {
   'variables': {
     'v8_enable_disassembler%': 0,
 
     'v8_enable_gdbjit%': 0,
 
+    'v8_enable_verify_csa%': 0,
+
     'v8_object_print%': 0,
 
     'v8_enable_verify_heap%': 0,
 
     'v8_trace_maps%': 0,
 
     # Enable the snapshot feature, for fast context creation.
     # http://v8project.blogspot.com/2015/09/custom-startup-snapshots.html
     'v8_use_snapshot%': 'true',
 
@@ skipping 25 matching lines @@
     'v8_js_accessors%': 0,
   },
   'target_defaults': {
     'conditions': [
       ['v8_enable_disassembler==1', {
         'defines': ['ENABLE_DISASSEMBLER',],
       }],
       ['v8_enable_gdbjit==1', {
         'defines': ['ENABLE_GDB_JIT_INTERFACE',],
       }],
+      ['v8_enable_verify_csa==1', {
+        'defines': ['ENABLE_VERIFY_CSA',],
+      }],
       ['v8_object_print==1', {
         'defines': ['OBJECT_PRINT',],
       }],
       ['v8_enable_verify_heap==1', {
         'defines': ['VERIFY_HEAP',],
       }],
       ['v8_trace_maps==1', {
         'defines': ['TRACE_MAPS',],
       }],
       ['v8_enable_verify_predictable==1', {
@@ skipping 36 matching lines @@
         },
         'conditions': [
           ['v8_enable_handle_zapping==1', {
             'defines': ['ENABLE_HANDLE_ZAPPING',],
           }],
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }