Mark DWARF lines in non-debuggable methods as "not a statement".

This is a hint to the debugger that breakpoints and stepping
might not function as intended (since we have limited information).

Change-Id: I23c4a816182cc7548fcd69fbd00112225e7b1710
diff --git a/compiler/debug/method_debug_info.h b/compiler/debug/method_debug_info.h
index 6b3dd8c..bb09f7e 100644
--- a/compiler/debug/method_debug_info.h
+++ b/compiler/debug/method_debug_info.h
@@ -30,6 +30,7 @@
   uint32_t access_flags;
   const DexFile::CodeItem* code_item;
   bool deduped;
+  bool is_native_debuggable;
   uintptr_t low_pc;
   uintptr_t high_pc;
   CompiledMethod* compiled_method;