Revert "ir: Fix sizeOf comparison with ptr to zst"

This reverts commit 89812217b4e5fee7e2851266c17c9d47204a1573.

This caused #4560
dad62a7e27Andrew Kelley committed on 2/26/2020, 2:23:35 AMparente9bac8b
2 files changedLine totals unavailable