Move some helper methods to DexRegisterLocation.

Test: test-art-host-gtest-stack_map_test
Change-Id: I0abab008159db023d531df69214cd3bb8c0639bd
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 02fb6cb..e3ae8a2 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -69,7 +69,9 @@
                           uint8_t inlining_depth);
   void EndStackMapEntry();
 
-  void AddDexRegisterEntry(DexRegisterLocation::Kind kind, int32_t value);
+  void AddDexRegisterEntry(DexRegisterLocation::Kind kind, int32_t value) {
+    current_dex_registers_.push_back(DexRegisterLocation(kind, value));
+  }
 
   void AddInvoke(InvokeType type, uint32_t dex_method_index);