Enable mini-debug-info by default.

All paths explicitly enable or disable the command line option.

However, if we missed some or developers use stand-alone tools,
default to working backtraces, which is the common intention.

Change-Id: I1d308f2be881522ecfb945d5f679065e726d32aa
diff --git a/compiler/driver/compiler_options.h b/compiler/driver/compiler_options.h
index ed8168a..da75d37 100644
--- a/compiler/driver/compiler_options.h
+++ b/compiler/driver/compiler_options.h
@@ -65,7 +65,7 @@
   static const size_t kDefaultNumDexMethodsThreshold = 900;
   static constexpr double kDefaultTopKProfileThreshold = 90.0;
   static const bool kDefaultGenerateDebugInfo = false;
-  static const bool kDefaultGenerateMiniDebugInfo = false;
+  static const bool kDefaultGenerateMiniDebugInfo = true;
   static const size_t kDefaultInlineMaxCodeUnits = 32;
   static constexpr size_t kUnsetInlineMaxCodeUnits = -1;