Add a panic helper for non-assert aborts.

We merged a fix for a "maybe uninitialized" warning in #1209, but after
merging there could actually have then been a double free.

The reason is that when compiling with NDEBUG our assert macro becomes a
no-op, meaning that execution would no longer stop after `assert(NULL)`.

This commit just adds a simple panic macro which will execute regardless
of whether NDEBUG is defined or not.

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