workaround xl-16 compiler bug(?)
workaround xl-16 compiler bug(?)

I think that using new style initialization {} is legal in this context,
but I might be wrong. Let's see whether the compiler is happier with the
alternate style.

JasonRuonanWang/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,ornladios/ADIOS2,ornladios/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,JasonRuonanWang/ADIOS2