ART: Add debuggable compiler flag

Add a flag to compiler options that shows debuggability.

Change-Id: Id17ec72babe2ee88713a0d274eff86508de30666
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 383308c..6d9f20e 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -1674,6 +1674,10 @@
   std::string feature_string("--instruction-set-features=");
   feature_string += features->GetFeatureString();
   argv->push_back(feature_string);
+
+  if (Dbg::IsJdwpConfigured()) {
+    argv->push_back("--debuggable");
+  }
 }
 
 void Runtime::UpdateProfilerState(int state) {