[intrinsics] Remove unused %_RegExpExec and %_NumberToString.

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 d139e674ff808a5c371a7604990ac0e768b91055..b3df5cab8bdc8a68792f7cc04bf8c6d25c7bc119 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -51,7 +51,6 @@ class V8_EXPORT_PRIVATE JSIntrinsicLowering final
   Reduction ReduceIsSmi(Node* node);
   Reduction ReduceFixedArrayGet(Node* node);
   Reduction ReduceFixedArraySet(Node* node);
-  Reduction ReduceRegExpExec(Node* node);
   Reduction ReduceSubString(Node* node);
   Reduction ReduceToInteger(Node* node);
   Reduction ReduceToLength(Node* node);