[interpreter] Bytecode register optimizer.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index d67a390d121021173bcfd22c29ac2b4621a96917..dc14b4daf6605c4ad285666ef27561a45478c7d4 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -491,6 +491,10 @@ class Bytecodes {
   static OperandSize GetOperandSize(Bytecode bytecode, int i,
                                     OperandScale operand_scale);
 
+  // Returns a pointer to an array of the operand sizes for |bytecode|.
+  static const OperandSize* GetOperandSizes(Bytecode bytecode,
+                                            OperandScale operand_scale);
+
   // Returns the offset of the i-th operand of |bytecode| relative to the start
   // of the bytecode.
   static int GetOperandOffset(Bytecode bytecode, int i,
@@ -624,9 +628,10 @@ class Bytecodes {
 
   // Return the OperandScale required for bytecode emission of
   // operand sizes.
+  static OperandScale OperandSizesToScale(OperandSize size0);
+  static OperandScale OperandSizesToScale(OperandSize size0, OperandSize size1);
   static OperandScale OperandSizesToScale(
-      OperandSize size0, OperandSize size1 = OperandSize::kByte,
-      OperandSize size2 = OperandSize::kByte,
+      OperandSize size0, OperandSize size1, OperandSize size2,
       OperandSize size3 = OperandSize::kByte);
 
  private: