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randall77 testing: callerName only needs one PC in the traceback
callerName requested 2 PCs from Callers, and that causes
both to be looked up in the file/line mapping.
We really only need to do the work for one PC.
(And in fact the caller doesn't need file/line at all, but
the Callers API can't express that.)

We used to request 2 PCs because in 1.11 and earlier we
stored an inline skip count in the second entry.
That's not necessary any more (as of 1.12).

Fixes #32093

Change-Id: I7b272626ef6496e848ee8af388cdaafd2556857b
Run-TryBot: Keith Randall <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Ian Lance Taylor <>
Reviewed-by: Caleb Spare <>
Latest commit 1ab063c May 17, 2019

The Go Programming Language

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