COMP: Intel compiler bug with inheriting constructors (fixes #1821)

- the compiler reports

      Internal error loop: assertion failed:
      find_seq_in_lookup_table: seq_number not found
      (shared/cfe/edgcpfe/il.c, line 4118)

  Seems to be the same as the bug report
  https://community.intel.com/t5/Intel-C-Compiler/Internal-error-loop-assertion-failed-find-seq-in-lookup-table/td-p/1087603

This _should_ be fixed in icc 17.0 update 1, but appears to have
struck here as well.

- workaround: explicitly construct member elements.