Don't assign safepoint at the definition to the definition's live-range.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, 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/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 1537 matching lines @@
       : instruction_(instruction), cls_(cls) { }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("StoreInstanceFieldSlowPath");
     __ Bind(entry_label());
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(cls_));
     const ExternalLabel label(stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out(0));
+    locs->live_registers()->Remove(locs->temp(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->temp(0).reg(), RAX);
     compiler->RestoreLiveRegisters(locs);
 
     __ jmp(exit_label());
@@ skipping 464 matching lines @@
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxDoubleSlowPath");
     __ Bind(entry_label());
     const Class& double_class = compiler->double_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(double_class));
     const ExternalLabel label(stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out(0));
+    ASSERT(!locs->live_registers()->Contains(locs->out(0)));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->out(0).reg(), RAX);
     compiler->RestoreLiveRegisters(locs);
 
     __ jmp(exit_label());
@@ skipping 11 matching lines @@
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxFloat32x4SlowPath");
     __ Bind(entry_label());
     const Class& float32x4_class = compiler->float32x4_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(float32x4_class));
     const ExternalLabel label(stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out(0));
+    ASSERT(!locs->live_registers()->Contains(locs->out(0)));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->out(0).reg(), RAX);
     compiler->RestoreLiveRegisters(locs);
 
     __ jmp(exit_label());
@@ skipping 11 matching lines @@
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxFloat64x2SlowPath");
     __ Bind(entry_label());
     const Class& float64x2_class = compiler->float64x2_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(float64x2_class));
     const ExternalLabel label(stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out(0));
+    ASSERT(!locs->live_registers()->Contains(locs->out(0)));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->out(0).reg(), RAX);
     compiler->RestoreLiveRegisters(locs);
 
     __ jmp(exit_label());
@@ skipping 1309 matching lines @@
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxInt32x4SlowPath");
     __ Bind(entry_label());
     const Class& int32x4_class = compiler->int32x4_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(int32x4_class));
     const ExternalLabel label(stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out(0));
+    ASSERT(!locs->live_registers()->Contains(locs->out(0)));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->out(0).reg(), RAX);
     compiler->RestoreLiveRegisters(locs);
 
     __ jmp(exit_label());
@@ skipping 2393 matching lines @@
   __ movq(R10, Immediate(kInvalidObjectPointer));
   __ movq(RBX, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64