Make enabling of CSA verifier a build-time flag

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 37 matching lines @@
 
   # Sets -dENABLE_GDB_JIT_INTERFACE.
   v8_enable_gdbjit = ""
 
   # Sets -dENABLE_HANDLE_ZAPPING.
   v8_enable_handle_zapping = true
 
   # Enable slow dchecks.
   v8_enable_slow_dchecks = false
 
+  # Enable code-generation-time checking of types in the CodeStubAssembler.
+  v8_enable_verify_csa = false
+
   # Interpreted regexp engine exists as platform-independent alternative
   # based where the regular expression is compiled to a bytecode.
   v8_interpreted_regexp = false
 
   # Sets -dOBJECT_PRINT.
   v8_enable_object_print = ""
 
   # Sets -dTRACE_MAPS.
   v8_enable_trace_maps = ""
 
@@ skipping 327 matching lines @@
     }
 
     defines += [ "DEBUG" ]
     if (v8_enable_slow_dchecks) {
       defines += [ "ENABLE_SLOW_DCHECKS" ]
     }
   } else if (dcheck_always_on) {
     defines += [ "DEBUG" ]
   }
 
+  if (v8_enable_verify_csa) {
+    defines += [ "ENABLE_VERIFY_CSA" ]
+  }
+
   if (v8_no_inline) {
     cflags += [
       "-fno-inline-functions",
       "-fno-inline",
     ]
   }
 
   if (is_clang) {
     cflags += [
       "-Wsign-compare",
@@ skipping 2670 matching lines @@
   ]
 
   configs = [
     ":external_config",
     ":internal_config_base",
   ]
 }
 
 v8_fuzzer("wasm_data_section_fuzzer") {
 }