Fix a braino in the stack layout.

Also do some refactoring to have this code be just in CodeGenerator.

Change-Id: I88de109889138af8d60027973c12a64bee813cb7
diff --git a/compiler/optimizing/code_generator_x86_64.h b/compiler/optimizing/code_generator_x86_64.h
index 97a0b2e..8283dda 100644
--- a/compiler/optimizing/code_generator_x86_64.h
+++ b/compiler/optimizing/code_generator_x86_64.h
@@ -125,7 +125,6 @@
   explicit CodeGeneratorX86_64(HGraph* graph);
   virtual ~CodeGeneratorX86_64() {}
 
-  virtual void ComputeFrameSize(size_t number_of_spill_slots) OVERRIDE;
   virtual void GenerateFrameEntry() OVERRIDE;
   virtual void GenerateFrameExit() OVERRIDE;
   virtual void Bind(Label* label) OVERRIDE;
@@ -135,6 +134,8 @@
     return kX86_64WordSize;
   }
 
+  virtual size_t FrameEntrySpillSize() const OVERRIDE;
+
   virtual HGraphVisitor* GetLocationBuilder() OVERRIDE {
     return &location_builder_;
   }
@@ -151,9 +152,7 @@
     return &move_resolver_;
   }
 
-  int32_t GetStackSlot(HLocal* local) const;
   virtual Location GetStackLocation(HLoadLocal* load) const OVERRIDE;
-  virtual Location GetTemporaryLocation(HTemporary* temp) const OVERRIDE;
 
   virtual size_t GetNumberOfRegisters() const OVERRIDE {
     return kNumberOfRegIds;