[Committed] PR fortran/85407 -- convert assert to fatal error

[Steve Kargl]

Back in April, I told Harald I would get around to committing
the attached patch.  Well, "around" has arrived.  The patch
has been tested on i586-*-freebsd and x86_64-*-freebsd.

The patch converts an assert into a gfc_fatal_error(), which
gives a user some information about the failure.  There is
no testcase as one need to go out of one's way to corrupt
the components in a derived typed in a *.mod file.

2018-12-26  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/85407
	* module.c (read_module): Convert assert to fatal error to give 
	user a sensible error message.

-- 
Steve
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