[regexp] Remove unused code

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index 4abf9e7c3fb35a1f081ac27846d7b088460acedb..6e984ff496539f5bc93813ab74fd54c44d85f662 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -49,10 +49,7 @@ class V8_EXPORT_PRIVATE JSIntrinsicLowering final
   Reduction ReduceIsSmi(Node* node);
   Reduction ReduceFixedArrayGet(Node* node);
   Reduction ReduceFixedArraySet(Node* node);
-  Reduction ReduceRegExpConstructResult(Node* node);
   Reduction ReduceRegExpExec(Node* node);
-  Reduction ReduceRegExpFlags(Node* node);
-  Reduction ReduceRegExpSource(Node* node);
   Reduction ReduceSubString(Node* node);
   Reduction ReduceToInteger(Node* node);
   Reduction ReduceToLength(Node* node);