Revert "CodeEmitter"

This reverts commit 75372ee132.

source/tlang/compiler/codegen/emit/core.d

@@ -165,11 +165,7 @@ public abstract class CodeEmitter
      *
      * Params:
      *   instruction = The Instruction to transform/emit
-     *   customRules = an `Object` to be interpreted by
-     * the underlying emitter which can change how certain
-     * transformations are done when it is in a certain state
-     *
      * Returns: The Instruction emit as a string
      */
-    public abstract string transform(Instruction instruction, Object customRules = null);
+    public abstract string transform(Instruction instruction);
 }

source/tlang/compiler/codegen/emit/dgen.d

@@ -110,7 +110,7 @@ public final class DCodeEmitter : CodeEmitter
     }
 
 
-    public override string transform(const Instruction instruction, Object customRules = null)
+    public override string transform(const Instruction instruction)
     {
         writeln("\n");
         gprintln("transform(): "~to!(string)(instruction));