[Bug gas/20896] AS: Buffer Overflow when expanding .irp directives

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20896

--- Comment #9 from Alan Modra <amodra at gmail dot com> ---
I can confirm you've cured the crash and valgrind failure, but there are excess
errors..

pr20896.s: Assembler messages:
pr20896.s: Warning: end of file in string; '"' inserted
pr20896.s:2: Warning: missing closing `"'
pr20896.s:3: Warning: missing closing `"'
pr20896.s:1: Error: unexpected end of file in irp or irpc

This also shows up as a fail of one of the mmix gas tests (paths trimmed a
little below).
gas/mmix/err-byte1.s: Assembler messages:
gas/mmix/err-byte1.s: Warning: end of file in string; '"' inserted
gas/mmix/err-byte1.s:10: Warning: missing closing `"'
gas/mmix/err-byte1.s:10: Error: unterminated string
gas/mmix/err-byte1.s:12: Warning: missing closing '"'
PASS: gas/mmix/err-byte1.s  (test for errors, line 10)
XFAIL: gas/mmix/err-byte1.s  (test for bogus messages, line )
FAIL: gas/mmix/err-byte1.s (test for excess errors)
Excess errors:
gas/mmix/err-byte1.s:12: Warning: missing closing '"'

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