Add option to never interpret.

Change-Id: Ib6d6170fa60c77c2e6a8844964f14fa0de4c9e7b
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
index 429edf6..a80f51f 100644
--- a/runtime/jit/jit.h
+++ b/runtime/jit/jit.h
@@ -86,6 +86,8 @@
   // into the specified class linker to the jit debug interface,
   void DumpTypeInfoForLoadedTypes(ClassLinker* linker);
 
+  bool JitAtFirstUse();
+
  private:
   Jit();
   bool LoadCompiler(std::string* error_msg);
@@ -142,6 +144,10 @@
   void SetSaveProfilingInfo(bool b) {
     save_profiling_info_ = b;
   }
+  void SetJitAtFirstUse() {
+    use_jit_ = true;
+    compile_threshold_ = 0;
+  }
 
  private:
   bool use_jit_;