Revert of [regexp] Remove remainder of native RegExpExecStub

src/compiler/code-assembler.h

Index: src/compiler/code-assembler.h
diff --git a/src/compiler/code-assembler.h b/src/compiler/code-assembler.h
index 1f2e4d8f4f9d1f4fcd694f2dbeacd59157d6b988..c79780c905dd121158f99d19fa5807e3f5b7b0f9 100644
--- a/src/compiler/code-assembler.h
+++ b/src/compiler/code-assembler.h
@@ -429,16 +429,6 @@
                        Node* arg1, Node* arg2, Node* arg3, Node* arg4,
                        Node* arg5);
 
-  // Call to a C function with nine arguments.
-  Node* CallCFunction9(MachineType return_type, MachineType arg0_type,
-                       MachineType arg1_type, MachineType arg2_type,
-                       MachineType arg3_type, MachineType arg4_type,
-                       MachineType arg5_type, MachineType arg6_type,
-                       MachineType arg7_type, MachineType arg8_type,
-                       Node* function, Node* arg0, Node* arg1, Node* arg2,
-                       Node* arg3, Node* arg4, Node* arg5, Node* arg6,
-                       Node* arg7, Node* arg8);
-
   // Exception handling support.
   void GotoIfException(Node* node, Label* if_exception,
                        Variable* exception_var = nullptr);