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

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index c0791c0e58722243343cb6c9327642d5b2173ac1..fe5cb619b50f7dfc6f730ff1e91322073639b830 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -194,7 +194,8 @@ MachineRepresentation StackSlotRepresentationOf(Operator const* op) {
   V(Float64InsertLowWord32, Operator::kNoProperties, 2, 0, 1)                 \
   V(Float64InsertHighWord32, Operator::kNoProperties, 2, 0, 1)                \
   V(LoadStackPointer, Operator::kNoProperties, 0, 0, 1)                       \
-  V(LoadFramePointer, Operator::kNoProperties, 0, 0, 1)
+  V(LoadFramePointer, Operator::kNoProperties, 0, 0, 1)                       \
+  V(LoadParentFramePointer, Operator::kNoProperties, 0, 0, 1)
 
 #define PURE_OPTIONAL_OP_LIST(V)                            \
   V(Word32Ctz, Operator::kNoProperties, 1, 0, 1)            \