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

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 6bd157afdeb58cf567f71c53892a84505a5c6594..196f6fba5162d5fc8ca5439a2a3de709e7306d11 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -471,6 +471,13 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArchFramePointer:
       __ mov(i.OutputRegister(), ebp);
       break;
+    case kArchParentFramePointer:
+      if (frame_access_state()->frame()->needs_frame()) {
+        __ mov(i.OutputRegister(), Operand(ebp, 0));
+      } else {
+        __ mov(i.OutputRegister(), ebp);
+      }
+      break;
     case kArchTruncateDoubleToI: {
       auto result = i.OutputRegister();
       auto input = i.InputDoubleRegister(0);