[turbofan] optimize redundant moves around splinter sites

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index 0410b417f84136a52c80b1a5940cd1651d99c2f2..b53151102527dd4a258f1776ed912e59be513a1b 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -1435,29 +1435,31 @@ bool RegisterAllocationData::IsBlockBoundary(LifetimePosition pos) const {
 }
 
 
-void RegisterAllocationData::Print(
-    const InstructionSequence* instructionSequence) {
+void Print(const RegisterConfiguration* config,
+           const InstructionSequence* instructionSequence) {
   OFStream os(stdout);
   PrintableInstructionSequence wrapper;
-  wrapper.register_configuration_ = config();
+  wrapper.register_configuration_ = config;
   wrapper.sequence_ = instructionSequence;
   os << wrapper << std::endl;
 }
 
 
-void RegisterAllocationData::Print(const Instruction* instruction) {
+void Print(const RegisterConfiguration* config,
+           const Instruction* instruction) {
   OFStream os(stdout);
   PrintableInstruction wrapper;
   wrapper.instr_ = instruction;
-  wrapper.register_configuration_ = config();
+  wrapper.register_configuration_ = config;
   os << wrapper << std::endl;
 }
 
 
-void RegisterAllocationData::Print(const LiveRange* range, bool with_children) {
+void Print(const RegisterConfiguration* config, const LiveRange* range,
+           bool with_children) {
   OFStream os(stdout);
   PrintableLiveRange wrapper;
-  wrapper.register_configuration_ = config();
+  wrapper.register_configuration_ = config;
   for (const LiveRange* i = range; i != nullptr; i = i->next()) {
     wrapper.range_ = i;
     os << wrapper << std::endl;
@@ -1466,19 +1468,19 @@ void RegisterAllocationData::Print(const LiveRange* range, bool with_children) {
 }
 
 
-void RegisterAllocationData::Print(const InstructionOperand& op) {
+void Print(const RegisterConfiguration* config, const InstructionOperand& op) {
   OFStream os(stdout);
   PrintableInstructionOperand wrapper;
-  wrapper.register_configuration_ = config();
+  wrapper.register_configuration_ = config;
   wrapper.op_ = op;
   os << wrapper << std::endl;
 }
 
 
-void RegisterAllocationData::Print(const MoveOperands* move) {
+void Print(const RegisterConfiguration* config, const MoveOperands* move) {
   OFStream os(stdout);
   PrintableInstructionOperand wrapper;
-  wrapper.register_configuration_ = config();
+  wrapper.register_configuration_ = config;
   wrapper.op_ = move->destination();
   os << wrapper << " = ";
   wrapper.op_ = move->source();
@@ -1486,7 +1488,7 @@ void RegisterAllocationData::Print(const MoveOperands* move) {
 }
 
 
-void RegisterAllocationData::Print(const SpillRange* spill_range) {
+void Print(const RegisterConfiguration* config, const SpillRange* spill_range) {
   OFStream os(stdout);
   os << "{" << std::endl;
   for (TopLevelLiveRange* range : spill_range->live_ranges()) {