Put live register bits in stackmaps.

runtime/vm/flow_graph_allocator.cc

Index: runtime/vm/flow_graph_allocator.cc
diff --git a/runtime/vm/flow_graph_allocator.cc b/runtime/vm/flow_graph_allocator.cc
index be5eae149f14f4f732d83cc3b3ae9adbe4375ad2..a50facd44fea7d216978b54e7cab0f24548bb605 100644
--- a/runtime/vm/flow_graph_allocator.cc
+++ b/runtime/vm/flow_graph_allocator.cc
@@ -1770,11 +1770,16 @@ void FlowGraphAllocator::ConvertAllUses(LiveRange* range) {
     ConvertUseTo(use, loc);
   }
 
+  // Add live registers at all safepoints for instructions with slow-path
+  // code.
   if (loc.IsMachineRegister()) {
     for (SafepointPosition* safepoint = range->first_safepoint();
          safepoint != NULL;
          safepoint = safepoint->next()) {
-      safepoint->locs()->live_registers()->Add(loc);
+      if (!safepoint->locs()->always_calls()) {
+        ASSERT(safepoint->locs()->can_call());
+        safepoint->locs()->live_registers()->Add(loc);
+      }
     }
   }
 }