ART: Initialize fields of ParsedOptions

Avoids certain paths where we touched uninitialized fields.

Bug: 17330858
Change-Id: Ia68161b12eefefacad6fc524f487f8e2caf6342a
diff --git a/runtime/parsed_options.h b/runtime/parsed_options.h
index c147465..3839e19 100644
--- a/runtime/parsed_options.h
+++ b/runtime/parsed_options.h
@@ -108,7 +108,7 @@
   uint64_t min_interval_homogeneous_space_compaction_by_oom_;
 
  private:
-  ParsedOptions() {}
+  ParsedOptions();
 
   void Usage(const char* fmt, ...);
   void UsageMessage(FILE* stream, const char* fmt, ...);