[PATCH] elf: Verify base symbol version works properly

[H.J. Lu]

Add a testcase to verify that VER_NDX_GLOBAL can be used with

asm (".symver foo_base, foo@");

to create the base version to provide an unversioned compatible symbol.

PR ld/33577
* testsuite/ld-elfvers/pass.out: New file.
* testsuite/ld-elfvers/pr33577-unversioned.c: Likewise.
* testsuite/ld-elfvers/pr33577-unversioned.rd: Likewise.
* testsuite/ld-elfvers/pr33577-versioned.c: Likewise.
* testsuite/ld-elfvers/pr33577-versioned.rd: Likewise.
* testsuite/ld-elfvers/pr33577.map: Likewise.
* testsuite/ld-elfvers/pr33577a.c: Likewise.
* testsuite/ld-elfvers/pr33577b.c: Likewise.
* testsuite/ld-elfvers/vers.exp: Run ld/33577 tests.

-- 
H.J.
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