Allow deoptimization from states with spilled 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 6fa92b019de3b64fbbf84b5f4b0b5f17a679f70d..0365d12e9240ac9ede506bfc709eca085523e6e9 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -54,9 +54,6 @@ void DeoptimizationStub::GenerateCode(FlowGraphCompiler* compiler) {
     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());