[build] Enable gn build for vtune support in v8.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 3d7f0a7badf91632f2c9e127cf2798b692656876..5f85c31f8bff21664d238f72289cb58bde8fb582 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -41,6 +41,9 @@ declare_args() {
   # Sets -dENABLE_GDB_JIT_INTERFACE.
   v8_enable_gdbjit = ""
 
+  # Sets -dENABLE_VTUNE_JIT_INTERFACE.
+  v8_enable_vtunejit = false
+
   # Sets -dENABLE_HANDLE_ZAPPING.
   v8_enable_handle_zapping = true
 
@@ -197,6 +200,9 @@ config("features") {
   if (v8_enable_gdbjit) {
     defines += [ "ENABLE_GDB_JIT_INTERFACE" ]
   }
+  if (v8_enable_vtunejit) {
+    defines += [ "ENABLE_VTUNE_JIT_INTERFACE" ]
+  }
   if (v8_enable_object_print) {
     defines += [ "OBJECT_PRINT" ]
   }
@@ -2638,8 +2644,6 @@ v8_executable("d8") {
     "//build/win:default_exe_manifest",
   ]
 
-  # TODO(jochen): Add support for vtunejit.
-
   if (is_posix) {
     sources += [ "src/d8-posix.cc" ]
   } else if (is_win) {
@@ -2658,6 +2662,10 @@ v8_executable("d8") {
   if (v8_enable_inspector) {
     defines += [ "V8_INSPECTOR_ENABLED" ]
   }
+
+  if (v8_enable_vtunejit) {
+    deps += [ "//src/third_party/vtune:v8_vtune" ]
+  }
 }
 
 v8_isolate_run("d8") {