Only install JitCodeEventHandler for GDB JIT if requested.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 3bd38bea5609ce4b04ebf392cc162a5360b03a7c..0a0cfa8bb7717f4734dcb47548e020af3e7bacd4 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1582,8 +1582,10 @@ int Shell::Main(int argc, char* argv[]) {
     Isolate::Scope scope(isolate);
     Initialize(isolate);
 #ifdef ENABLE_GDB_JIT_INTERFACE
-    v8::V8::SetJitCodeEventHandler(v8::kJitCodeEventDefault,
-                                   i::GDBJITInterface::EventHandler);
+    if (i::FLAG_gdbjit) {
+      v8::V8::SetJitCodeEventHandler(v8::kJitCodeEventDefault,
+                                     i::GDBJITInterface::EventHandler);
+    }
 #endif
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
     vTune::InitializeVtuneForV8();