Use zone when allocating handles in FlowGraphCompiler assembling operations. Add profiling VM tags…

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/constant_propagator.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 31 matching lines @@
 DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 
 Definition::Definition(intptr_t deopt_id)
     : Instruction(deopt_id),
       range_(NULL),
       type_(NULL),
       temp_index_(-1),
       ssa_temp_index_(-1),
       input_use_list_(NULL),
       env_use_list_(NULL),
-      constant_value_(Object::ZoneHandle(ConstantPropagator::Unknown())) {
+      constant_value_(NULL) {
 }
 
 
+// A value in the constant propagation lattice.
+//    - non-constant sentinel
+//    - a constant (any non-sentinel value)
+//    - unknown sentinel
+Object& Definition::constant_value() {
+  if (constant_value_ == NULL) {
+    constant_value_ = &Object::ZoneHandle(ConstantPropagator::Unknown());
+  }
+  return *constant_value_;
+}
+
+
 Definition* Definition::OriginalDefinition() {
   Definition* defn = this;
   while (defn->IsRedefinition() || defn->IsAssertAssignable()) {
     if (defn->IsRedefinition()) {
       defn = defn->AsRedefinition()->value()->definition();
     } else {
       defn = defn->AsAssertAssignable()->value()->definition();
     }
   }
   return defn;
@@ skipping 3568 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart