V2 [PATCH] x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker:

[Florian Weimer]

* H. J. Lu via Binutils:

> Here is the updated patch with -z x86-64-v[234] linker command line
> option to mark x86-64-v[234] ISA level as needed.

I think this needs a marker for the baseline as well.  Currently, a
missing marker can either mean “the programmer did not specify a marker”
or “the object uses the baseline ABI”.

Thanks,
Florian
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