[PATCH Coroutines]Fix ICE when co_awaiting on void type

[bin.cheng]

Hi,

This simple patch skips calling complete_type_or_else for void type, which fixes the
corresponding ICE.

Thanks,
bin

gcc/cp
2020-01-20  Bin Cheng  <bin.linux@linux.alibaba.com>

        * coroutines.cc (build_co_await): Skip getting complete type for void.

gcc/testsuite
2020-01-20  Bin Cheng  <bin.linux@linux.alibaba.com>

        * g++.dg/coroutines/co-await-void_type.C: New test.
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