Fix crash during parallel moves.

runtime/vm/locations.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
@@ skipping 44 matching lines @@
     ASSERT((kConstant & kConstantMask) == kConstant);
     return (value_ & kConstantMask) == kConstant;
   }
 
   static Location Constant(const Object& obj) {
     Location loc(reinterpret_cast<uword>(&obj) | kConstant);
     ASSERT(&obj == &loc.constant());
     return loc;
   }
 
-  const Object& constant() {
+  const Object& constant() const {
     ASSERT(IsConstant());
     return *reinterpret_cast<const Object*>(value_ & ~kConstantMask);
   }
 
   // Unallocated locations.
   enum Policy {
     kRequiresRegister,
     kSameAsFirstInput,
   };
 
@@ skipping 81 matching lines @@
 class LocationSummary : public ZoneAllocated {
  public:
   enum ContainsCall {
     kNoCall,
     kCall,
   };
 
   // TODO(vegorov): remove unsafe kNoCall default.
   LocationSummary(intptr_t input_count,
                   intptr_t temp_count,
-                  ContainsCall call = kNoCall)
-      : input_locations_(input_count),
-        temp_locations_(temp_count),
-        output_location_(),
-        is_call_(call == kCall) {
-    for (intptr_t i = 0; i < input_count; i++) {
-      input_locations_.Add(Location());
-    }
-    for (intptr_t i = 0; i < temp_count; i++) {
-      temp_locations_.Add(Location());
-    }
-  }
+                  ContainsCall call = kNoCall);
 
   intptr_t input_count() const {
     return input_locations_.length();
   }
 
   Location in(intptr_t index) const {
     return input_locations_[index];
   }
 
   Location* in_slot(intptr_t index) {
@@ skipping 49 matching lines @@
   GrowableArray<Location> temp_locations_;
   Location output_location_;
 
   const bool is_call_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_