Previously, two useless FE_RESET_R and FE_FREE would be left over whether the empty array
was from a literal, a variable, or a class constant.
This doesn't pick up the RESET_RW case due to a weakness in our "may throw"
modeling. (for foreach by reference).
Co-Authored-By: Nikita Popov <nikita.ppv@gmail.com>
using https://gist.github.com/nikic/58d367ad605e10299f5433d2d83a0b5b
Closes GH-4949
df0fa5b178