Introduce -Xint flag for ART.

Change-Id: I0f7d8c0b0f33e77ca2d3fbf05b7a16fedb86a545
diff --git a/src/runtime.h b/src/runtime.h
index d2238ae..79c0592 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -76,6 +76,7 @@
     std::string jni_trace_;
     bool is_compiler_;
     bool is_zygote_;
+    bool interpreter_only_;
     bool is_concurrent_gc_enabled_;
     size_t heap_initial_size_;
     size_t heap_maximum_size_;
@@ -112,6 +113,10 @@
     return is_zygote_;
   }
 
+  bool InterpreterOnly() const {
+    return interpreter_only_;
+  }
+
   bool IsConcurrentGcEnabled() const {
     return is_concurrent_gc_enabled_;
   }
@@ -377,6 +382,7 @@
 
   bool is_compiler_;
   bool is_zygote_;
+  bool interpreter_only_;
   bool is_concurrent_gc_enabled_;
 
   // The host prefix is used during cross compilation. It is removed