reflect: don't panic in ArrayOf if elem size is 0
We do a division by the elem type size to check if the array size would be too large for the virtual address space. This is a silly check if the size is 0, but the problem is that it means a division by zero and a panic. Since arrays of empty structs are valid in a regular program, make them also work in reflect. Use a separate, explicit test with struct{}{} to make sure the test for a zero-sized type is not confused with the rest. Fixes #20313. Change-Id: I47b8b87e6541631280b79227bdea6a0f6035c9e0 Reviewed-on: https://go-review.googlesource.com/43131 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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