ART: Fix missing initialization in stack_map_stream.h

Fixes stack_map_test.

Change-Id: Ibd6659b589ec595a7af21ad3d727c0ab2dceb45c
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 3c6ad8f..5e1329e 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -35,7 +35,8 @@
       : stack_maps_(allocator, 10),
         dex_register_maps_(allocator, 10 * 4),
         inline_infos_(allocator, 2),
-        stack_mask_max_(-1) {}
+        stack_mask_max_(-1),
+        number_of_stack_maps_with_inline_info_(0) {}
 
   // Compute bytes needed to encode a mask with the given maximum element.
   static uint32_t StackMaskEncodingSize(int max_element) {