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

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 37d3161dc4870cf71137a2398251e0dce5834e52..975268fb87f9a0cd000d20ae842e533581fc45e0 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -626,6 +626,13 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArchFramePointer:
       __ mov(i.OutputRegister(), fp);
       break;
+    case kArchParentFramePointer:
+      if (frame_access_state()->frame()->needs_frame()) {
+        __ ldr(i.OutputRegister(), MemOperand(fp, 0));
+      } else {
+        __ mov(i.OutputRegister(), fp);
+      }
+      break;
     case kArchTruncateDoubleToI:
       __ TruncateDoubleToI(i.OutputRegister(), i.InputDoubleRegister(0));
       break;