[Bug binutils/29042] opcodes libtool regression

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29042

--- Comment #5 from Sam James <sam at gentoo dot org> ---
I suspect this is the same as an issue we've been hitting in Gentoo
(https://bugs.gentoo.org/834720) which is mostly noticeable if built the
previous system copy of binutils with --enable-pgo=lto (or otherwise built
binutils with LTO) with an older GCC, then rebuilding with a newer different
version of GCC which marks itself as having a different bitcode version.

Manifests as (remains for newer versions):
```
lto1: fatal error: bytecode stream in file
'/usr/lib64/binutils/x86_64-pc-linux-gnu/2.37_p1/libiberty.a' generated with
LTO version 11.0 instead of the expected 11.2
compilation terminated.
lto-wrapper: fatal error: x86_64-pc-linux-gnu-gcc returned 1 exit status
compilation terminated.
```

I ended up hitting the same issue, just manifesting differently recently, when
GCC's bitcode changed for 13.

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