[PR c++/70565] ICE at gimplify.c:8832 (cilkplus array extension)

[Aldy Hernandez <aldyh at redhat dot com>]

The problem at hand can be seen in this simple testcase:

int array[999];
void foo()
{
  _Cilk_for (int i=0; i < 999; ++i)
    array[:] = 0;
}

The issue here is that the _Cilk_for degrades into an OMP PARALLEL, and 
we fail to expand the array extension in the body of the OMP PARALLEL.

This is probably an obvious patch, but just in case... OK for trunk?

Aldy

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