Hydrogen: Re-use regular comparisons infrastructure for switch statements

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 61e98b2b0ce9c0053c131098bd74d30a4cc15c2f..b2fd14c3ab9f32d65a52d05fdbb3913bee628072 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -2323,6 +2323,15 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
   void HandleLiteralCompareNil(CompareOperation* expr,
                                Expression* sub_expr,
                                NilValue nil);
+  HControlInstruction* BuildCompareInstruction(Token::Value op,
+                                               HValue* left,
+                                               HValue* right,
+                                               Handle<Type> left_type,
+                                               Handle<Type> right_type,
+                                               Handle<Type> combined_type,
+                                               int left_position,
+                                               int right_position,
+                                               BailoutId bailout_id);
 
   HInstruction* BuildStringCharCodeAt(HValue* string,
                                       HValue* index);