[stubs] Add RegExpReplace and RegExpSplit stubs

src/builtins/builtins-regexp.h

Index: src/builtins/builtins-regexp.h
diff --git a/src/builtins/builtins-regexp.h b/src/builtins/builtins-regexp.h
index 0b169a96684d74c763bb5bc9fcc8bcaa10446c78..e2e53322c638a11b35f65189c8f299c7a5ea6456 100644
--- a/src/builtins/builtins-regexp.h
+++ b/src/builtins/builtins-regexp.h
@@ -19,8 +19,7 @@ class RegExpBuiltinsAssembler : public CodeStubAssembler {
   explicit RegExpBuiltinsAssembler(CodeAssemblerState* state)
       : CodeStubAssembler(state) {}
 
-  void BranchIfFastRegExp(Node* context, Node* map, Label* if_isunmodified,
-                          Label* if_ismodified);
+  Node* IsFastRegExpMap(Node* context, Node* map);
 
  protected:
   Node* FastLoadLastIndex(Node* regexp);