Revert of Optimize trivial regexp disjunctions

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index ff96c3d08f13f74075b2b4d42da6f7d6d3292992..616ac5a8cb98e88307b9104c768e769e971cbdf4 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -2866,9 +2866,6 @@
   int max_match() override { return max_match_; }
   ZoneList<RegExpTree*>* alternatives() { return alternatives_; }
  private:
-  bool SortConsecutiveAtoms(RegExpCompiler* compiler);
-  void RationalizeConsecutiveAtoms(RegExpCompiler* compiler);
-  void FixSingleCharacterDisjunctions(RegExpCompiler* compiler);
   ZoneList<RegExpTree*>* alternatives_;
   int min_match_;
   int max_match_;