[interpreter] Reduce move operations for wide register support.

src/interpreter/register-translator.h

Index: src/interpreter/register-translator.h
diff --git a/src/interpreter/register-translator.h b/src/interpreter/register-translator.h
index 783924d34c92d09d68bc9430b240c7ff08990518..ca66f501a785e923cd6bcf21946d5701bdde7f67 100644
--- a/src/interpreter/register-translator.h
+++ b/src/interpreter/register-translator.h
@@ -90,9 +90,12 @@ class RegisterTranslator final {
   // translation.
   bool emitting_moves_;
 
-  // State for restoring registers after bytecode.
-  Register window_registers_[kTranslationWindowLength];
+  // Number of window registers in use.
   int window_registers_count_;
+
+  // State for restoring register moves emitted by TranslateOutputRegisters.
+  std::pair<Register, Register> output_moves_[kTranslationWindowLength];
+  int output_moves_count_;
 };
 
 // Interface for RegisterTranslator helper class that will emit