Put PushArgument into the environment instead of raw values.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
diff --git a/runtime/vm/flow_graph_compiler_x64.cc b/runtime/vm/flow_graph_compiler_x64.cc
index 460387922a800748a88262d35b9adc9e4e3eae6e..11ddd379e2d9ab3a3258d652e7402bed69968288 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -48,16 +48,24 @@ void DeoptimizationStub::GenerateCode(FlowGraphCompiler* compiler,
     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.
+    intptr_t height = compiler->StackSize();
     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.IsInvalid()) {
-        ASSERT(values[i]->IsConstant());
-        source = Location::Constant(values[i]->AsConstant()->value());
+        Value* value = values[i];
+        if (value->IsConstant()) {
+          source = Location::Constant(value->AsConstant()->value());
+        } else {
+          ASSERT(value->IsUse() &&
+                 value->AsUse()->definition()->IsPushArgument());
+          source = Location::StackSlot(height++);
+        }
       }
       move->AddMove(destination, source);
     }