[turbofan] Add an operator to access the parent frame pointer

src/compiler/instruction-scheduler.cc

Index: src/compiler/instruction-scheduler.cc
diff --git a/src/compiler/instruction-scheduler.cc b/src/compiler/instruction-scheduler.cc
index dce5135a3bebf41504d76422f8d71f11d40b2ad1..2b2ee71b0de3b3ad040ff2d519bf95d263cf28ce 100644
--- a/src/compiler/instruction-scheduler.cc
+++ b/src/compiler/instruction-scheduler.cc
@@ -174,6 +174,7 @@ int InstructionScheduler::GetInstructionFlags(const Instruction* instr) const {
     case kArchNop:
     case kArchStackPointer:
     case kArchFramePointer:
+    case kArchParentFramePointer:
     case kArchTruncateDoubleToI:
     case kArchStackSlot:
       return kNoOpcodeFlags;