Add Zone-based handle allocation interface and reduce use of Isolate-based interfaces.

runtime/vm/constant_propagator.cc

Index: runtime/vm/constant_propagator.cc
===================================================================
--- runtime/vm/constant_propagator.cc	(revision 43075)
+++ runtime/vm/constant_propagator.cc	(working copy)
@@ -30,10 +30,10 @@
       graph_(graph),
       unknown_(Object::unknown_constant()),
       non_constant_(Object::non_constant()),
-      reachable_(new(graph->isolate()) BitVector(
-          graph->isolate(), graph->preorder().length())),
-      marked_phis_(new(graph->isolate()) BitVector(
-          graph->isolate(), graph->max_virtual_register_number())),
+      reachable_(new(graph->zone()) BitVector(

[Ivan Posva, 2015/01/23 19:49:24]

How about defining Z in this file?

[koda, 2015/01/23 21:12:10]

Done.

+          graph->zone(), graph->preorder().length())),
+      marked_phis_(new(graph->zone()) BitVector(
+          graph->zone(), graph->max_virtual_register_number())),
       block_worklist_(),
       definition_worklist_(graph, 10) {}
 
@@ -1430,7 +1430,8 @@
   // Canonicalize branches that have no side-effects and where true- and
   // false-targets are the same.
   bool changed = false;
-  BitVector* empty_blocks = new(I) BitVector(I, graph_->preorder().length());
+  BitVector* empty_blocks = new(graph_->zone()) BitVector(graph_->zone(),
+      graph_->preorder().length());
   for (BlockIterator b = graph_->postorder_iterator();
        !b.Done();
        b.Advance()) {