[csa] Make argc parameter to CodeStubArguments constructor use ParameterMode

src/builtins/builtins-string.cc

Index: src/builtins/builtins-string.cc
diff --git a/src/builtins/builtins-string.cc b/src/builtins/builtins-string.cc
index f2b784cf053b409f5a7982329d3839582afa9d27..ac9742339e87e577c9b4d1b3deca5acf10400766 100644
--- a/src/builtins/builtins-string.cc
+++ b/src/builtins/builtins-string.cc
@@ -420,7 +420,7 @@ TF_BUILTIN(StringFromCharCode, CodeStubAssembler) {
   Node* argc = Parameter(BuiltinDescriptor::kArgumentsCount);
   Node* context = Parameter(BuiltinDescriptor::kContext);
 
-  CodeStubArguments arguments(this, argc);
+  CodeStubArguments arguments(this, ChangeInt32ToIntPtr(argc));
   // From now on use word-size argc value.
   argc = arguments.GetLength();
 
@@ -886,7 +886,7 @@ TF_BUILTIN(StringPrototypeIndexOf, StringBuiltinsAssembler) {
   Node* argc = Parameter(BuiltinDescriptor::kArgumentsCount);
   Node* context = Parameter(BuiltinDescriptor::kContext);
 
-  CodeStubArguments arguments(this, argc);
+  CodeStubArguments arguments(this, ChangeInt32ToIntPtr(argc));
   Node* receiver = arguments.GetReceiver();
   // From now on use word-size argc value.
   argc = arguments.GetLength();