Use Primitive.interop_execute instead of .call in posix.rb

* Avoids an extra 2 calls.
* Avoids a IndirectCallNode because CachedCallSignatureNode does not
  ReportPolymorphism yet (will be fixed).

Author: eregon

src/main/ruby/truffleruby/core/posix.rb

@@ -140,7 +140,7 @@ def self.attach_function_eagerly(native_name, argument_types, return_type,
             result = Primitive.thread_run_blocking_nfi_system_call(bound_func, args)
           end while Primitive.is_a?(result, Integer) and result == -1 and Errno.errno == EINTR
         else
-          result = bound_func.call(*args)
+          result = Primitive.interop_execute(bound_func, args)
         end
 
         if return_type == :string