Add a check in non-debug mode for a T_NONE classHEADmaster

Although a crash could occur anywhere, one of the most common symptoms
we see from getting a reference to a garbage collected object is
crashing while attempting to call a method on it.

These crashes usually occur when trying to perform an rb_id_table_lookup
in the "class" cc_tbl, where the class is usually another garbage
collected object, because the freelist is stored in the class pointer.

This commit aims to have a better error message in this case, in hopes
of having a better grouping of errors and to give a better hint to those
investigating and triaging crashes.

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