runtime: drop redundant argument to getArgInfo
The f funcInfo argument is always the same as frame.fn, so we don't
need to pass it. I suspect that was there to make the signatures of
getArgInfoFast and getArgInfo more similar, but it's not necessary.
For #54466.
Change-Id: Idc717f4df09e97cad49d52c5b7edf28090908cba
Reviewed-on: https://go-review.googlesource.com/c/go/+/424255
Run-TryBot: Austin Clements <austin@google.com>
Auto-Submit: Austin Clements <austin@google.com>
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