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

src/compiler/code-stub-assembler.cc

Index: src/compiler/code-stub-assembler.cc
diff --git a/src/compiler/code-stub-assembler.cc b/src/compiler/code-stub-assembler.cc
index f4ecab605bc2977eda7de9d79d3fd1291cc9db29..45f47d3310933dc50a8b8feb7ec5c12149c5a844 100644
--- a/src/compiler/code-stub-assembler.cc
+++ b/src/compiler/code-stub-assembler.cc
@@ -103,6 +103,10 @@ Node* CodeStubAssembler::LoadFramePointer() {
   return raw_assembler_->LoadFramePointer();
 }
 
+Node* CodeStubAssembler::LoadParentFramePointer() {
+  return raw_assembler_->LoadParentFramePointer();
+}
+
 Node* CodeStubAssembler::LoadStackPointer() {
   return raw_assembler_->LoadStackPointer();
 }