Move common static helpers from codegen to the macro-assembler files.

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
===================================================================
--- src/ia32/codegen-ia32.h	(revision 5806)
+++ src/ia32/codegen-ia32.h	(working copy)
@@ -352,10 +352,6 @@
     return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
   }
 
-  static Operand ContextOperand(Register context, int index) {
-    return Operand(context, Context::SlotOffset(index));
-  }
-
  private:
   // Type of a member function that generates inline code for a native function.
   typedef void (CodeGenerator::*InlineFunctionGenerator)
@@ -441,10 +437,6 @@
                                             JumpTarget* slow);
 
   // Expressions
-  static Operand GlobalObject() {
-    return ContextOperand(esi, Context::GLOBAL_INDEX);
-  }
-
   void LoadCondition(Expression* expr,
                      ControlDestination* destination,
                      bool force_control);