[string] Widen StringIndexOf fast path

src/compiler/raw-machine-assembler.cc

Index: src/compiler/raw-machine-assembler.cc
diff --git a/src/compiler/raw-machine-assembler.cc b/src/compiler/raw-machine-assembler.cc
index a2cf5621150449182bf51df1a16192f645395af7..00b02087cb9e7a9c70fe74fd0075258c77c8bfe7 100644
--- a/src/compiler/raw-machine-assembler.cc
+++ b/src/compiler/raw-machine-assembler.cc
@@ -257,6 +257,26 @@ Node* RawMachineAssembler::CallCFunction3(MachineType return_type,
   return AddNode(common()->Call(descriptor), function, arg0, arg1, arg2);
 }
 
+Node* RawMachineAssembler::CallCFunction6(
+    MachineType return_type, MachineType arg0_type, MachineType arg1_type,
+    MachineType arg2_type, MachineType arg3_type, MachineType arg4_type,
+    MachineType arg5_type, Node* function, Node* arg0, Node* arg1, Node* arg2,
+    Node* arg3, Node* arg4, Node* arg5) {
+  MachineSignature::Builder builder(zone(), 1, 6);
+  builder.AddReturn(return_type);
+  builder.AddParam(arg0_type);
+  builder.AddParam(arg1_type);
+  builder.AddParam(arg2_type);
+  builder.AddParam(arg3_type);
+  builder.AddParam(arg4_type);
+  builder.AddParam(arg5_type);
+  const CallDescriptor* descriptor =
+      Linkage::GetSimplifiedCDescriptor(zone(), builder.Build());
+
+  return AddNode(common()->Call(descriptor), function, arg0, arg1, arg2, arg3,
+                 arg4, arg5);
+}
+
 Node* RawMachineAssembler::CallCFunction8(
     MachineType return_type, MachineType arg0_type, MachineType arg1_type,
     MachineType arg2_type, MachineType arg3_type, MachineType arg4_type,