[PATCH v2] Avoid self-test failures on x86-linux

[Tom Tromey]

Luis> Isn't this a broader issue? I recently reported some failures in the
Luis> gdb.base/all-architectures-2.exp, where disassembling fails due to 
Luis> (apparently) some recent changes in error reporting.

Do you have a link?

I've only run into this particular problem, and when I wrote the fix, I
looked through opcodes to find other similar instances, and didn't find
any.

Tom