[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..f14a41e051fbd4aba01aae6f7f14dd5227a2980a 100644
--- a/src/builtins/builtins-regexp.h
+++ b/src/builtins/builtins-regexp.h
@@ -19,8 +19,9 @@ class RegExpBuiltinsAssembler : public CodeStubAssembler {
   explicit RegExpBuiltinsAssembler(CodeAssemblerState* state)
       : CodeStubAssembler(state) {}
 
-  void BranchIfFastRegExp(Node* context, Node* map, Label* if_isunmodified,
-                          Label* if_ismodified);
+  void BranchIfFastRegExp(Node* const context, Node* const map,
+                          Label* const if_isunmodified,
+                          Label* const if_ismodified);
 
  protected:
   Node* FastLoadLastIndex(Node* regexp);
@@ -48,6 +49,9 @@ class RegExpBuiltinsAssembler : public CodeStubAssembler {
                              MessageTemplate::Template msg_template,
                              char const* method_name);
 
+  // Analogous to BranchIfFastRegExp, for use in asserts.
+  Node* IsFastRegExpMap(Node* const context, Node* const map);
+
   Node* IsInitialRegExpMap(Node* context, Node* map);
   void BranchIfFastRegExpResult(Node* context, Node* map,
                                 Label* if_isunmodified, Label* if_ismodified);