cmd/link: don't include arginfo symbols in symbol table

We recently add arginfo symbols for traceback argument metadata.
Like other metadata symbols (GC bitmaps, opendefer info, etc.),
skip arginfo symbols for symbol table as well.

Fixes #45971.

Change-Id: I7a126b75f70ec88e2170e9a274d968762c7bce56
Reviewed-on: https://go-review.googlesource.com/c/go/+/317769


Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>