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

src/compiler/code-generator-impl.h

Index: src/compiler/code-generator-impl.h
diff --git a/src/compiler/code-generator-impl.h b/src/compiler/code-generator-impl.h
index f0762e9bbec2e0657c6e8372e643c0eed4db47d0..d5158f61a66b06b6a89c960281889a09ffc1b587 100644
--- a/src/compiler/code-generator-impl.h
+++ b/src/compiler/code-generator-impl.h
@@ -94,6 +94,12 @@ class InstructionOperandConverter {
   }
 
   Register ToRegister(InstructionOperand* op) {
+    if (op->kind() == InstructionOperand::STACK_POINTER) {
+      return StandardFrame::sp_register();
+    }
+    if (op->kind() == InstructionOperand::FRAME_POINTER) {
+      return StandardFrame::fp_register();
+    }
     return Register::FromAllocationIndex(RegisterOperand::cast(op)->index());
   }