[Bug 233343] the sh(1) bind(1) builtin segfaults in 12RC1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233343

            Bug ID: 233343
           Summary: the sh(1) bind(1) builtin segfaults in 12RC1
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mason at blisses.org

Created attachment 199366
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199366&action=edit
lightly redacted core file from sh(1)

bleb on Freenode #freebsd noted that he saw the sh(1) bind(1) when piping it
into less(1). I could reproduce it, although it's sporadic. I've also seen it
piping into more(1) and redirecting to a file. I see it both both running sh(1)
and exec'ing it from my current shell.

$ bind | more
Segmentation fault (core dumped)

I'm attaching the core, with some string subs in place to help obscure the
system identity.

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