[Bug gas/25295] Gas should have way to define symbol version without exporting its target

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25295

--- Comment #22 from Fangrui Song <i at maskray dot me> ---
I believe the "local" and "hidden" optional arguments will never be useful.

.symver foo, foo@VERS_1, local
.symver foo, foo@VERS_2, hidden

For @@ definition, users already have `.symver foo, foo@@@VERS_1`

This PR addresses the lingering symbol problem for @ with "remove".


However, I think adding a new directive is probably better to fix all the
confusion around @@@ and local/hidden/remove. The new directive should just do
symbol renaming.
(https://maskray.me/blog/2020-11-26-all-about-symbol-versioning#Assembler-behavior
)

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