Unifying the handling of storing and loading from safepoint stack

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 16361ad2390ffeea3a19c4f1789f0a2e10f8ab60..62bb0f36343c93019e5dd5ed87076addd6fab91d 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -143,7 +143,11 @@ class MacroAssembler: public Assembler {
   // Push and pop the registers that can hold pointers.
   void PushSafepointRegisters() { pushad(); }
   void PopSafepointRegisters() { popad(); }
-  static int SafepointRegisterStackIndex(int reg_code);
+  // Store the value in register/immediate src in the safepoint
+  // register stack slot for register dst.
+  void StoreToSafepointRegisterSlot(Register dst, Register src);
+  void StoreToSafepointRegisterSlot(Register dst, Immediate src);
+  void LoadFromSafepointRegisterSlot(Register dst, Register src);
 
   // ---------------------------------------------------------------------------
   // JavaScript invokes
@@ -667,6 +671,15 @@ class MacroAssembler: public Assembler {
   MUST_USE_RESULT MaybeObject* PopHandleScopeHelper(Register saved,
                                                     Register scratch,
                                                     bool gc_allowed);
+
+
+  // Compute memory operands for safepoint stack slots.
+  Operand SafepointRegisterSlot(Register reg);
+  static int SafepointRegisterStackIndex(int reg_code);
+
+  // Needs access to SafepointRegisterStackIndex for optimized frame
+  // traversal.
+  friend class OptimizedFrame;
 };