[turbofan] CodeGenerator: Frame setup refactoring

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 b82181c3314d12f1845f33eb180182eec336fc64..9e0793421dd54dc757c68897cc6ca8f3c3609a90 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -54,7 +54,7 @@ class CodeGenerator final : public GapResolver::Assembler {
 
   InstructionSequence* code() const { return code_; }
   FrameAccessState* frame_access_state() const { return frame_access_state_; }
-  Frame* frame() const { return frame_access_state_->frame(); }
+  const Frame* frame() const { return frame_access_state_->frame(); }
   Isolate* isolate() const { return info_->isolate(); }
   Linkage* linkage() const { return linkage_; }
 
@@ -67,6 +67,12 @@ class CodeGenerator final : public GapResolver::Assembler {
   Zone* zone() const { return code()->zone(); }
   CompilationInfo* info() const { return info_; }
 
+  // Create the FrameAccessState object. The Frame is immutable from here on.
+  void CreateFrameAccessState(Frame* frame);
+
+  // Architecture - specific frame finalization.
+  void FinishFrame(Frame* frame);
+
   // Checks if {block} will appear directly after {current_block_} when
   // assembling code, in which case, a fall-through can be used.
   bool IsNextInAssemblyOrder(RpoNumber block) const;
@@ -108,9 +114,7 @@ class CodeGenerator final : public GapResolver::Assembler {
 
   // Generates an architecture-specific, descriptor-specific prologue
   // to set up a stack frame.
-  void AssemblePrologue();
-
-  void AssembleSetupStackPointer();
+  void AssembleConstructFrame();
 
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.