[turbofan]: Elide extra move when accessing stack or frame register

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 5bf858a86cf6e7551ce7a033603cc7c17990cbe2..3c775efdbc4f2d386745e2d6b0853fa34717b296 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -166,6 +166,8 @@ UsePositionHintType UsePosition::HintTypeForOperand(
   switch (op.kind()) {
     case InstructionOperand::CONSTANT:
     case InstructionOperand::IMMEDIATE:
+    case InstructionOperand::STACK_POINTER:
+    case InstructionOperand::FRAME_POINTER:
       return UsePositionHintType::kNone;
     case InstructionOperand::UNALLOCATED:
       return UsePositionHintType::kUnresolved;
@@ -1245,7 +1247,10 @@ void ConstraintBuilder::MeetConstraintsBefore(int instr_index) {
   // Handle fixed input operands of second instruction.
   for (size_t i = 0; i < second->InputCount(); i++) {
     auto input = second->InputAt(i);
-    if (input->IsImmediate()) continue;  // Ignore immediates.
+    if (input->IsImmediate() || input->IsStackPointer() ||
+        input->IsFramePointer()) {
+      continue;  // Ignore immediates and special registers
+    }
     auto cur_input = UnallocatedOperand::cast(input);
     if (cur_input->HasFixedPolicy()) {
       int input_vreg = cur_input->virtual_register();
@@ -1518,7 +1523,10 @@ void LiveRangeBuilder::ProcessInstructions(const InstructionBlock* block,
 
     for (size_t i = 0; i < instr->InputCount(); i++) {
       auto input = instr->InputAt(i);
-      if (input->IsImmediate()) continue;  // Ignore immediates.
+      if (input->IsImmediate() || input->IsStackPointer() ||
+          input->IsFramePointer()) {
+        continue;  // Ignore immediates and special registers
+      }
       LifetimePosition use_pos;
       if (input->IsUnallocated() &&
           UnallocatedOperand::cast(input)->IsUsedAtStart()) {