Now we have a proper C++ library, use std::unique_ptr.

Also remove the Android.libcxx.mk and other bits of stlport compatibility
mechanics.

Change-Id: Icdf7188ba3c79cdf5617672c1cfd0a68ae596a61
diff --git a/compiler/dex/ssa_transformation.cc b/compiler/dex/ssa_transformation.cc
index 5f89c21..5aa093a 100644
--- a/compiler/dex/ssa_transformation.cc
+++ b/compiler/dex/ssa_transformation.cc
@@ -182,7 +182,7 @@
     dom_post_order_traversal_->Reset();
   }
   ClearAllVisitedFlags();
-  std::vector<std::pair<BasicBlock*, ArenaBitVector::Iterator*> > work_stack;
+  std::vector<std::pair<BasicBlock*, ArenaBitVector::Iterator*>> work_stack;
   bb->visited = true;
   work_stack.push_back(std::make_pair(bb, bb->i_dominated->GetIterator()));
   while (!work_stack.empty()) {