PATCH: Sema allow casting 0 to event_t for OpenCL

[Tom Stellard]

Hi,

This patch allows OpenCL programs to cast 0 as event_t e.g.

void foo(event_t e);

foo((event_t)0);

This is allowed by the OpenCL specification.

If this patch is approved, would it be OK to merge it to the
3.5 branch?

Thanks,
Tom
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