| Index: runtime/vm/flow_graph_allocator.cc | 
| diff --git a/runtime/vm/flow_graph_allocator.cc b/runtime/vm/flow_graph_allocator.cc | 
| index 78f850e4d481522396654da1b6fc208d5228afb1..07e3086244a9185e7a0c9ee7b15a2e9690108095 100644 | 
| --- a/runtime/vm/flow_graph_allocator.cc | 
| +++ b/runtime/vm/flow_graph_allocator.cc | 
| @@ -118,6 +118,7 @@ FlowGraphAllocator::FlowGraphAllocator(const FlowGraph& flow_graph, | 
| } | 
| blocked_cpu_registers_[SPREG] = true; | 
| blocked_cpu_registers_[FPREG] = true; | 
| +  blocked_cpu_registers_[THR] = true; | 
|  | 
| // FpuTMP is used as scratch by optimized code and parallel move resolver. | 
| blocked_fpu_registers_[FpuTMP] = true; | 
|  |