[turbofan] Frame elision for code stubs

src/compiler/code-generator.h

Index: src/compiler/code-generator.h
diff --git a/src/compiler/code-generator.h b/src/compiler/code-generator.h
index f1e99ec8d2817880df0b1892c407b341ac80ecd1..421bee58445dfb08fc339d30b593163133f1f5e2 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -57,7 +57,6 @@ class CodeGenerator final : public GapResolver::Assembler {
   Frame* frame() const { return frame_access_state_->frame(); }
   Isolate* isolate() const { return info_->isolate(); }
   Linkage* linkage() const { return linkage_; }
-
   Label* GetLabel(RpoNumber rpo) { return &labels_[rpo.ToSize()]; }
 
  private:
@@ -106,6 +105,9 @@ class CodeGenerator final : public GapResolver::Assembler {
   // Generates an architecture-specific, descriptor-specific prologue
   // to set up a stack frame.
   void AssemblePrologue();
+
+  void SetupStackPointer();
+
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.
   void AssembleReturn();
@@ -113,6 +115,16 @@ class CodeGenerator final : public GapResolver::Assembler {
   // Generates code to deconstruct a the caller's frame, including arguments.
   void AssembleDeconstructActivationRecord(int stack_param_delta);
 
+  // Deconstruct the frame, if the frame_access_state requires it.
+  void AssembleDeconstructFrameIfNeeded();
+  // Deconstruct the frame, if the frame_access_state requires it, and update or
+  // reuse the return label. If the return block deconstructs, do not
+  // deconstruct twice. Return true if this resulted in completing the exit from
+  // the frame, and therefore there is nothing left to do.
+  bool AssembleDeconstructFrameUsingReturnLabel();
+
+  void AssembleDeconstructFrame();
+
   // Generates code to manipulate the stack in preparation for a tail call.
   void AssemblePrepareTailCall(int stack_param_delta);