ART: Initialization of RegLocation and API for GrowableArray Iterator

Two things:

- Added a default initialization for the RegLocation.
- Added a default constructor and Reset for the GrowableArray's Iterator class.

Change-Id: I74d9c584304c77add42e0d66e4037ac45b890142
Signed-off-by: Jean Christophe Beyler <jean.christophe.beyler@intel.com>
Signed-off-by: Razvan A Lupusoru <razvan.a.lupusoru@intel.com>
Signed-off-by: Yixin Shou <yixin.shou@intel.com>
Signed-off-by: Chao-ying Fu <chao-ying.fu@intel.com>
Signed-off-by: Udayan Banerji <udayan.banerji@intel.com>
diff --git a/compiler/dex/vreg_analysis.cc b/compiler/dex/vreg_analysis.cc
index 8769736..4be0f59 100644
--- a/compiler/dex/vreg_analysis.cc
+++ b/compiler/dex/vreg_analysis.cc
@@ -415,6 +415,7 @@
     loc[i] = fresh_loc;
     loc[i].s_reg_low = i;
     loc[i].is_const = is_constant_v_->IsBitSet(i);
+    loc[i].wide = false;
   }
 
   /* Patch up the locations for the compiler temps */