Allow deoptimization from states with spilled values.

runtime/vm/flow_graph_compiler_x64.cc

 // 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 36 matching lines @@
     const intptr_t local_slot_count = values.length() - fixed_parameter_count;
     const intptr_t top_offset =
         ParsedFunction::kFirstLocalSlotIndex - (local_slot_count - 1);
     __ leaq(RSP, Address(RBP, top_offset * kWordSize));
 
     // 2. Build and emit a parallel move representing the frame translation.
     ParallelMoveInstr* move = new ParallelMoveInstr();
     for (intptr_t i = 0; i < values.length(); i++) {
       Location destination = Location::StackSlot(i - fixed_parameter_count);
       Location source = deoptimization_env_->LocationAt(i);
-      if (!source.IsRegister() && !source.IsInvalid()) {
-        compiler->Bailout("unsupported deoptimization state");
-      }
       if (source.IsInvalid()) {
         ASSERT(values[i]->IsConstant());
         source = Location::Constant(values[i]->AsConstant()->value());
       }
       move->AddMove(destination, source);
     }
     compiler->parallel_move_resolver()->EmitNativeCode(move);
   }
 
   if (compiler->IsLeaf()) {
@@ skipping 1159 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64